Fix violations of unnecessary_parenthesis lint

https://dart-lang.github.io/linter/lints/unnecessary_parenthesis.html

Remove parentheses where they are not necessary.

Discussion: https://groups.google.com/a/google.com/g/dart-lints/c/8l7liE-khQk/m/z8qKlIQYBAAJ

go/dart-trivial-lint-cleanup-lsc

Tested:
    TAP train for global presubmit queue
    http://test/OCL:507704828:BASE:507730771:1675786959002:dcee7be6
PiperOrigin-RevId: 508021974

lib/src/builder.dart

@@ -2252,11 +2252,11 @@ extension on int {
   String get ordinal {
     final remainder = this % 10;
     switch (remainder) {
-      case (1):
+      case 1:
         return '${this}st';
-      case (2):
+      case 2:
         return '${this}nd';
-      case (3):
+      case 3:
         return '${this}rd';
       default:
         return '${this}th';