Fix GitHub labeler platform-android typo (#175076)

`git ls-files "packages/flutter_tools/*android*'"` returns nothing. Fix
typo from https://github.com/flutter/flutter/pull/159166.

This caused https://github.com/flutter/flutter/pull/169544 to not get
the correct label.



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.github/labeler.yml

@@ -152,7 +152,7 @@ platform-android:
     - any-glob-to-any-file:
       - docs/platform/android/**/*
       - engine/src/flutter/shell/platform/android/**/*
-      - packages/flutter_tools/*android*'
+      - packages/flutter_tools/*android*
       - packages/flutter_tools/gradle/**/*
 
 platform-ios: