Update LanguageFeatures/Instantiate-to-bounds/class/static tests according to https://github.com/dart-lang/language/pull/1133 

dart-lang/language#1133 has been landed, and this means that any test that expects a compile-time error because of a failing i2b that is caused by a type variable which is invariant or unused should be changed to stop expecting that error.

LanguageFeatures/Instantiate-to-bounds/class/static tests should be updated accordingly.