Do not delete chost widgets when opening DB.

During restore, the data can be in inconsistant state, as the
system is yet to give us the widget map. Deleting the widget during
open would cause the AppWidgetRestoredReceiver to store the widget id
after it has been deleted.

Bug: 37935101
Bug: 38029633
Change-Id: Id3b8766229718239ae784794e848dcfbc74658ac

src/com/android/launcher3/LauncherProvider.java

@@ -755,7 +755,6 @@ public class LauncherProvider extends ContentProvider {
                     }
                 }
                 case 2:
-                    removeGhostWidgets(db);
                 case 3:
                     // data updated
                     return;