Fix versionCode

ERROR: android.defaultConfig.versionCode is set to 0, but it should be a positive integer.
See https://developer.android.com/studio/publish/versioning#appversioning for more information.
Affected Modules: app

Source/Android/app/build.gradle

@@ -123,5 +123,5 @@ def getBuildVersionCode() {
         logger.error('Cannot find git, defaulting to dummy version number')
     }
 
-    return 0;
+    return 1;
 }