Remove unused NotifUser::getFormattedNotificationCount()
Remove unused NotifUser::getFormattedNotificationCount()

As of 0790125dd441ff2, this is unused.

Change-Id: I7d7080cd2c45c14a3fb59fc3b9d224fac8e55dd8

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo