Remove incorrect part of int-to-double test.

Switch statements on ints aren't required to be exhaustive.

Change-Id: I85701b098cacf9d01241dab821ae4c70f04a0710
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/289450
Commit-Queue: Bob Nystrom <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>
Reviewed-by: Konstantin Shcheglov <[email protected]>
Auto-Submit: Bob Nystrom <[email protected]>

Author: munificent

tests/language/patterns/int_to_double_error_test.dart

@@ -22,16 +22,6 @@ main() {
   //                    ^
   // [cfe] The matched value of type 'int' isn't assignable to the required type 'double'.
 
-  // Non-exhaustive since double case doesn't cover uncoerced int type.
-  switch (123) {
-//^^^^^^
-// [analyzer] COMPILE_TIME_ERROR.NON_EXHAUSTIVE_SWITCH
-//        ^
-// [cfe] The type 'int' is not exhaustively matched by the switch cases.
-    case double d:
-      Expect.fail('Should not have matched.');
-  }
-
   // Non-exhaustive since double case doesn't cover uncoerced int type.
   var result = switch (123) {
     //         ^^^^^^