🐛: santoku-appのgoogle-services.dummy.jsonをそのまま使えるように修正 (#355)

## ✅ What's done

- [x] santoku-appのandroid/app/google-sevices.dummy.jsonのpackage_nameを`dummy`から`jp.fintan.mobile.santokuapp`と`jp.fintan.mobile.santokuapp.debug`に修正

santoku-app/android/app/google-services.dummy.json

@@ -9,7 +9,7 @@
       "client_info": {
         "mobilesdk_app_id": "1:111111111111:android:0000000000111111111122",
         "android_client_info": {
-          "package_name": "dummy"
+          "package_name": "jp.fintan.mobile.santokuapp"
         }
       },
       "oauth_client": [
@@ -45,7 +45,7 @@
       "client_info": {
         "mobilesdk_app_id": "1:111111111111:android:0000000000111111111122",
         "android_client_info": {
-          "package_name": "dummy"
+          "package_name": "jp.fintan.mobile.santokuapp.debug"
         }
       },
       "oauth_client": [