f353db012effe3d5cf90195cf5b0b3036333bd52 Fix: Remove the use of `Arra…

…y.prototype.flat()` as it wasn't supported in Safari until v12

https://datatables.net/forums/discussion/79829

Sync to source repo @f353db012effe3d5cf90195cf5b0b3036333bd52

datatables.json

@@ -14,5 +14,5 @@
     ],
     "src-repo": "http://github.com/DataTables/DataTablesSrc",
     "last-tag": "2.1.6",
-    "last-sync": "cfcb5d9c77fadc54f90ebe80edf0c8cc4c9b9b76"
+    "last-sync": "f353db012effe3d5cf90195cf5b0b3036333bd52"
 }