EventDetailScreen [join] button must clear invite for such event / call accept if user is invited
Joining an event using the [join] header button with a pending invite leaves the invite hanging, it should be cleared
Look if there's an invite pending, show Accept invite button instead
Make sure the header updates when invite is received (See DrawerButton)
EventDetailScreen [join] button must clear invite for such event / call accept if user is invited Joining an event using the [join] header button with a pending invite leaves the invite hanging, it should be cleared
DrawerButton)