View Case - Activity selector getTotalCount is missing a case parameter - so pager is incorrect

This code will probably be refactored - but we should fix this bug up front to make sure we don't propagate it.

When we build the Activity selector for "View Case" - we correctly pass a $case parameter to getRows(), but we do NOT pass it to getTotalCount() - so the pager count will reflect ALL activities for that contact rather than only the activities linked to the case being viewed. (CRM/Activity/Selector/Activity.php)