Change build-tools back to 28.0.3
Change build-tools back to 28.0.3

Change-Id: Id6abdebcba2691fa3f56016f21ce3103d7d98501

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