Avoid use of plain 'None' in tests

For some reason the parser resolves the ambiguity between None as a PathPat or IdentPat
differently on the Action runners vs local machine.

rust/ql/test/extractor-tests/generated/BoxPat/BoxPat.expected

@@ -1,2 +1,2 @@
-| gen_box_pat.rs:6:9:6:19 | BoxPat | getInner: | gen_box_pat.rs:6:13:6:19 | TupleStructPat |
-| gen_box_pat.rs:7:9:7:16 | BoxPat | getInner: | gen_box_pat.rs:7:13:7:16 | PathPat |
+| gen_box_pat.rs:6:9:6:27 | BoxPat | getInner: | gen_box_pat.rs:6:13:6:27 | TupleStructPat |
+| gen_box_pat.rs:7:9:7:24 | BoxPat | getInner: | gen_box_pat.rs:7:13:7:24 | PathPat |

rust/ql/test/extractor-tests/generated/IdentPat/IdentPat.expected

@@ -1,2 +1,2 @@
-| gen_ident_pat.rs:6:14:6:14 | IdentPat | getBindingId: | y | hasSubpat: | no |
-| gen_ident_pat.rs:10:9:10:17 | IdentPat | getBindingId: | y | hasSubpat: | yes |
+| gen_ident_pat.rs:6:22:6:22 | IdentPat | getBindingId: | y | hasSubpat: | no |
+| gen_ident_pat.rs:10:9:10:25 | IdentPat | getBindingId: | y | hasSubpat: | yes |

rust/ql/test/extractor-tests/generated/IdentPat/IdentPat_getSubpat.expected

@@ -1 +1 @@
-| gen_ident_pat.rs:10:9:10:17 | IdentPat | gen_ident_pat.rs:10:11:10:17 | TupleStructPat |
+| gen_ident_pat.rs:10:9:10:25 | IdentPat | gen_ident_pat.rs:10:11:10:25 | TupleStructPat |

rust/ql/test/extractor-tests/generated/MatchArm/MatchArm.expected

@@ -1,4 +1,4 @@
-| gen_match_arm.rs:6:9:6:15 | MatchArm | getPat: | gen_match_arm.rs:6:9:6:15 | TupleStructPat | hasGuard: | no | getExpr: | gen_match_arm.rs:6:20:6:20 | PathExpr |
-| gen_match_arm.rs:7:9:7:12 | MatchArm | getPat: | gen_match_arm.rs:7:9:7:12 | PathPat | hasGuard: | no | getExpr: | gen_match_arm.rs:7:17:7:17 | Literal |
+| gen_match_arm.rs:6:9:6:23 | MatchArm | getPat: | gen_match_arm.rs:6:9:6:23 | TupleStructPat | hasGuard: | no | getExpr: | gen_match_arm.rs:6:28:6:28 | PathExpr |
+| gen_match_arm.rs:7:9:7:20 | MatchArm | getPat: | gen_match_arm.rs:7:9:7:20 | PathPat | hasGuard: | no | getExpr: | gen_match_arm.rs:7:25:7:25 | Literal |
 | gen_match_arm.rs:10:9:10:15 | MatchArm | getPat: | gen_match_arm.rs:10:9:10:15 | TupleStructPat | hasGuard: | yes | getExpr: | gen_match_arm.rs:10:30:10:34 | BinExpr |
 | gen_match_arm.rs:11:9:11:9 | MatchArm | getPat: | gen_match_arm.rs:11:9:11:9 | WildcardPat | hasGuard: | no | getExpr: | gen_match_arm.rs:11:14:11:14 | Literal |

rust/ql/test/extractor-tests/generated/MatchExpr/MatchExpr_getBranch.expected

@@ -1,4 +1,4 @@
-| gen_match_expr.rs:5:5:8:5 | MatchExpr | 0 | gen_match_expr.rs:6:9:6:15 | MatchArm |
-| gen_match_expr.rs:5:5:8:5 | MatchExpr | 1 | gen_match_expr.rs:7:9:7:12 | MatchArm |
+| gen_match_expr.rs:5:5:8:5 | MatchExpr | 0 | gen_match_expr.rs:6:9:6:23 | MatchArm |
+| gen_match_expr.rs:5:5:8:5 | MatchExpr | 1 | gen_match_expr.rs:7:9:7:20 | MatchArm |
 | gen_match_expr.rs:9:5:12:5 | MatchExpr | 0 | gen_match_expr.rs:10:9:10:15 | MatchArm |
 | gen_match_expr.rs:9:5:12:5 | MatchExpr | 1 | gen_match_expr.rs:11:9:11:9 | MatchArm |

rust/ql/test/extractor-tests/generated/OrPat/OrPat.expected

@@ -1 +1 @@
-| gen_or_pat.rs:6:9:6:22 | OrPat | getNumberOfArgs: | 2 |
+| gen_or_pat.rs:6:9:6:38 | OrPat | getNumberOfArgs: | 2 |

rust/ql/test/extractor-tests/generated/OrPat/OrPat_getArg.expected

@@ -1,2 +1,2 @@
-| gen_or_pat.rs:6:9:6:22 | OrPat | 0 | gen_or_pat.rs:6:9:6:15 | TupleStructPat |
-| gen_or_pat.rs:6:9:6:22 | OrPat | 1 | gen_or_pat.rs:6:19:6:22 | PathPat |
+| gen_or_pat.rs:6:9:6:38 | OrPat | 0 | gen_or_pat.rs:6:9:6:23 | TupleStructPat |
+| gen_or_pat.rs:6:9:6:38 | OrPat | 1 | gen_or_pat.rs:6:27:6:38 | PathPat |

rust/ql/test/extractor-tests/generated/RefPat/RefPat.expected

@@ -1,2 +1,2 @@
-| gen_ref_pat.rs:6:9:6:20 | RefPat | getPat: | gen_ref_pat.rs:6:14:6:20 | TupleStructPat | isMut: | yes |
-| gen_ref_pat.rs:7:9:7:13 | RefPat | getPat: | gen_ref_pat.rs:7:10:7:13 | PathPat | isMut: | no |
+| gen_ref_pat.rs:6:9:6:28 | RefPat | getPat: | gen_ref_pat.rs:6:14:6:28 | TupleStructPat | isMut: | yes |
+| gen_ref_pat.rs:7:9:7:21 | RefPat | getPat: | gen_ref_pat.rs:7:10:7:21 | PathPat | isMut: | no |