Fix loading local images (#4769)

When loading local image resource (images in Drawable folder), RNN mistakingly tried to load the image as a js asset even if it successfully loaded the local image.

lib/android/app/src/main/java/com/reactnativenavigation/utils/ImageLoader.java

     @NonNull
     private Drawable getDrawable(Context context, String source) throws IOException {
         Drawable drawable;
-
         if (isLocalFile(Uri.parse(source))) {
             drawable = loadFile(source);
         } else {
             drawable = loadResource(source);
-            if (drawable == null || NavigationApplication.instance.isDebug()) {
+            if (drawable == null && NavigationApplication.instance.isDebug()) {
                 drawable = readJsDevImage(context, source);
             }
         }
-
+        if (drawable == null) throw new RuntimeException("Could not load image " + source);
         return drawable;
     }