Update flutter.yml

Author: hoc081098

.github/workflows/flutter.yml

@@ -22,10 +22,10 @@ jobs:
         run: flutter packages get
 
       - name: Format
-        run: flutter format lib test example --set-exit-if-changed
+        run: flutter format lib test --set-exit-if-changed
 
       - name: Analyze
-        run: flutter analyze lib test example
+        run: flutter analyze lib test
 
       - name: Run tests
         run: flutter test --coverage --coverage-path=lcov.info