mGerrit: Fix project card not properly being removed

Previously swiping away a selected project would only
affect your current tab. Changing tabs would reselect
the project, a very frustrating "feature".

Now swiping away a selected project has the expected
result of not showing the project as selected while
navigating throughout the app.

Thanks Evan Conway from the Google PlayStore for pointing
this out!

Change-Id: I5bfec6ba3be86dee87c4a13fdead4e300b897472