[dart2wasm] Remove obsolete patch annotation declaration

Required to match https://dart-review.googlesource.com/c/sdk/+/224946

Change-Id: I271fca2b408583ad0a645b6bcbea3f3ac129e015
Cq-Include-Trybots: luci.dart.try:dart2wasm-linux-x64-d8-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/261901
Auto-Submit: Aske Simon Christensen <[email protected]>
Commit-Queue: Joshua Litt <[email protected]>
Reviewed-by: Joshua Litt <[email protected]>

Author: askeksa

sdk/lib/_internal/wasm/lib/patch.dart

@@ -175,7 +175,6 @@
         "patches": [
           "_internal/wasm/lib/internal_patch.dart",
           "_internal/wasm/lib/class_id.dart",
-          "_internal/wasm/lib/patch.dart",
           "_internal/wasm/lib/print_patch.dart",
           "_internal/wasm/lib/symbol_patch.dart"
         ]

sdk/lib/libraries.json

@@ -167,7 +167,6 @@ wasm:
       patches:
       - _internal/wasm/lib/internal_patch.dart
       - _internal/wasm/lib/class_id.dart
-      - _internal/wasm/lib/patch.dart
       - _internal/wasm/lib/print_patch.dart
       - _internal/wasm/lib/symbol_patch.dart
     _js_annotations: