Invalidate the options menu on visibility changes.

Currently, we set the mShowOptionsMenu when the visibility of the
fragment changes. However, it may be possible to update this after the
options menu has been created but before the menu is prepared, which
would lead the menu to be in an inconsistent state.

By invalidating the options menu, we are guaranteed it will be
re-created.

Bug: 5335885
Change-Id: I1183d898d6e4867845aa04e054273bf271695d02