CallWindow: fix toggling the microphone on and off
CallWindow: fix toggling the microphone on and off

We are changing the GSettings key, and also listening to changes
on it and reacting to them, but we don't want to react to our own
changes!

https://bugzilla.gnome.org/show_bug.cgi?id=656415

Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets