Update Windows build workflow triggers

Removed push trigger for 'gh-build' branch and added workflow_dispatch event.

Author: Mikachu2333

.github/workflows/build-on-Windows.yml

@@ -11,8 +11,7 @@
 
 name: 构建于 Windows
 on:
-  push:
-    branches: [ "gh-build" ]
+  workflow_dispatch:
 
 jobs:
   build-and-upload: