Revert "fix #30462, update function_type tests to understand covariant generics"

tests/language_2/function_type/function_type63_test.dart

Index: tests/language_2/function_type/function_type63_test.dart
diff --git a/tests/language_2/function_type/function_type63_test.dart b/tests/language_2/function_type/function_type63_test.dart
index 5c8ee2435bfbb30b947636cd89e50a3f0e5d59e3..2649f3393ca834ea8dec051dcdb2d036c47654f1 100644
--- a/tests/language_2/function_type/function_type63_test.dart
+++ b/tests/language_2/function_type/function_type63_test.dart
@@ -254,10 +254,10 @@ class U63<T> {
       });
     }
     if (tIsInt || tIsBool) {
-      Expect.equals(true, m1 is F1<int>);
-      Expect.equals(true, m1 is F1<bool>);
-      Expect.equals(true, confuse(m1) is F1<int>);
-      Expect.equals(true, confuse(m1) is F1<bool>);
+      Expect.equals(tIsInt, m1 is F1<int>);
+      Expect.equals(tIsBool, m1 is F1<bool>);
+      Expect.equals(tIsInt, confuse(m1) is F1<int>);
+      Expect.equals(tIsBool, confuse(m1) is F1<bool>);
     }
   }