Start shortcuts with singleTop, but not all launches

This will prevent shortcuts from creating many views, and causing
them to leak. However, do not use singleTop for all launches
of the view activity, else the edit mode cannot be entered.

app/src/main/java/protect/card_locker/LoyaltyCardViewActivity.java

@@ -322,6 +322,9 @@ public class LoyaltyCardViewActivity extends AppCompatActivity
     {
         Intent shortcutIntent = new Intent(this, LoyaltyCardViewActivity.class);
         shortcutIntent.setAction(Intent.ACTION_MAIN);
+        // Prevent instances of the view activity from piling up; if one exists let this
+        // one replace it.
+        shortcutIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
         Bundle bundle = new Bundle();
         bundle.putInt("id", id);
         bundle.putBoolean("view", true);