Fix make-release script.
Fix make-release script.

Due to a typo, it wasn't finding the final built universal APK correctly.

Change-Id: Ic81826a9744f98a94779e4804cd1ecfc2ec9c528

wikimedia/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia