ActionMode fixes found in testing

- Fix onSupportActionModeFinished() being called twice.
  Caused by double wrapping the callback which means that
  each call is called twice.
- Fix onPrepareActionMode not being called. Caused by setting
  the current action mode too late.

BUG: 28378961
BUG: 28392319

Change-Id: I7e41f1396c7230a37880c8c812d4622e969e032b
6 files changed