Fixes: NB#294188 - Facebook IM contacts have invalid capabilities after booting (like after SSU)
Fixes: NB#294188 - Facebook IM contacts have invalid capabilities after booting (like after SSU)

RevBy: cocos (MR#51)
Details: Always delete old caps before updating nco:imCapabilities.

matthewvogt/contactsd,matthewvogt/contactsd,matthewvogt/contactsd,matthewvogt/contactsd