Restore old behavior of launching LOVE from launcher after ae465f8.

The old behavior is to re-start no-game screen when launching LOVE from app launcher for non-embed builds.

love/src/main/java/org/love2d/android/GameActivity.java

@@ -204,6 +204,7 @@ public class GameActivity extends SDLActivity {
             // No game specified via the intent data or embed build is used.
             // Load game archive only when needed.
             needToCopyGameInArchive = embed;
+            gamePath = "";
         }
 
         Log.d("GameActivity", "new gamePath: " + gamePath);