Patterns parser: remove bogus error recovery logic.

The "recovery" condition `|| /* recovery */ optional(':', next)` had
no effect, because that case was already covered by the previous `if`
statement.

Bug: #50035
Change-Id: I4eeeeb2ff6b3558888f07c65d85e9f79e334d9eb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/292661
Reviewed-by: Konstantin Shcheglov <[email protected]>

pkg/_fe_analyzer_shared/lib/src/parser/parser_impl.dart

@@ -10098,14 +10098,12 @@ class Parser {
         break;
       }
       Token? colon = null;
-      // TODO(paulberry): test error recovery
       if (optional(':', next)) {
         wasRecord = true;
         wasValidRecord = true;
         listener.handleNoName(token);
         colon = token = next;
-      } else if (optional(':', next.next!) || /* recovery */
-          optional(':', next)) {
+      } else if (optional(':', next.next!)) {
         // Record with named expression.
         wasRecord = true;
         token = ensureIdentifier(