Stop ignoring hidden files and directories in the `assets` directory

(cherry picked from commit bf76d2afcf6d36fa26acb12d52031130e6ce012b)

platform/android/java/app/build.gradle

@@ -87,6 +87,11 @@ android {
     }
 
     defaultConfig {
+        // The default ignore pattern for the 'assets' directory includes hidden files and directories which are used by Godot projects.
+        aaptOptions {
+            ignoreAssetsPattern "!.svn:!.git:!.ds_store:!*.scc:<dir>_*:!CVS:!thumbs.db:!picasa.ini:!*~"
+        }
+
         // Feel free to modify the application id to your own.
         applicationId getExportPackageName()
         minSdkVersion versions.minSdk