Update gutenberg ref with new JS bundle location

Author: mchowning

.circleci/config.yml

@@ -54,7 +54,7 @@ commands:
           name: Cache JS Bundle
           key: android-js-bundle-{{ checksum "gutenberg_submodule_hash" }}
           paths:
-            - libs/gutenberg-mobile/react-native-gutenberg-bridge/android/src/main/assets/index.android.bundle
+            - libs/gutenberg-mobile/react-native-gutenberg-bridge/android/build/assets/index.android.bundle
   restore-gutenberg-bundle-cache:
     steps:
       - run:
@@ -77,7 +77,7 @@ jobs:
       - run:
           name: Abort If JS Bundle Exists
           command: |
-            if [ -f "libs/gutenberg-mobile/react-native-gutenberg-bridge/android/src/main/assets/index.android.bundle" ]; then
+            if [ -f "libs/gutenberg-mobile/react-native-gutenberg-bridge/android/build/assets/index.android.bundle" ]; then
               echo "Gutenberg-Mobile bundle already in cache, no need to create a new one."
               circleci-agent step halt
             else
@@ -88,10 +88,10 @@ jobs:
       - yarn-bundle-android
       - run:
           name: Ensure assets folder exists
-          command: mkdir -p libs/gutenberg-mobile/react-native-gutenberg-bridge/android/src/main/assets
+          command: mkdir -p libs/gutenberg-mobile/react-native-gutenberg-bridge/android/build/assets
       - run:
           name: Move bundle to assets folder
-          command: mv libs/gutenberg-mobile/bundle/android/App.js libs/gutenberg-mobile/react-native-gutenberg-bridge/android/src/main/assets/index.android.bundle
+          command: mv libs/gutenberg-mobile/bundle/android/App.js libs/gutenberg-mobile/react-native-gutenberg-bridge/android/build/assets/index.android.bundle
       - save-gutenberg-bundle-cache
   test:
     executor: