Fix missed calls notifications not shown after you call someone

Steps to reproduce the issue fixed by this commit:
- call the contact XXX, then close the call
- the contact XXX calls you, then he disconnects the call
- you don't get missed call notifications anymore, till a reboot

Change-Id: I1ce301845144dc918d80c39b1f93871734092366
NB: The code is part of the CM
1 file changed