Improve counter-examples for "Enum Type Default Value Uses Inaccessible Value"

[glen-84]

The following example violates this rule because the default value for the field
field in type Input1 references an enum value (FOO) that is marked as
@inaccessible.

type Query {
  field(arg: Enum1 = FOO): [Baz!]!
}

input Input1 {
  field: Enum1 = FOO
}

directive @directive1(arg: Enum1 = FOO) on FIELD_DEFINITION

enum Enum1 {
  FOO @inaccessible
  BAR
}

type Query {
  field(arg: Input1 = { field2: "ERROR" }): [Baz!]!
}

directive @directive1(arg: Input1 = { field2: "ERROR" }) on FIELD_DEFINITION

input Input1 {
  field1: String
  field2: String @inaccessible
}

1. The first counter-example references the usage of FOO on Input1.field, but then there are two other usages of FOO that don't seem necessary.
2. The second counter-example has no enum types.