ci: update Android build task to target app module

Author: radoslawrolka

.github/workflows/android-build-test-fabric.yml

@@ -46,4 +46,4 @@ jobs:
         run: yarn
       - name: Build app
         working-directory: ${{ env.WORKING_DIRECTORY }}/android
-        run: ./gradlew assembleDebug --console=plain -PreactNativeArchitectures=arm64-v8a
+        run: ./gradlew :app:assembleDebug --console=plain -PreactNativeArchitectures=arm64-v8a