Resize the hangup button in ::realize
Resize the hangup button in ::realize

So that it's not resized many times.

https://bugzilla.gnome.org/show_bug.cgi?id=580794

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