Contacts : fix FAB when an InCall plugin tab is in focus

There was an issue where the FAB was not updated onResume right after
an InCall plugin auth state change. onPrepareOptionsMenu is always called
upon onResume to update the InCall plugin FAB, but it's always called before
the plugin update callback and was checking stale plugin auth info. This fix
ensures updatePluginFab is always called
-a plugin tab is in focus
-in the end of updatePlugins (to check against the latest plugin auth info)

Issue-id: FEIJ-691

Change-Id: I0e09eb7149c70a0eb16b5b3ad23c7032d94d64da