[help] Remove obsolete banshee.omf.in.
[help] Remove obsolete banshee.omf.in.

This is no longer needed with Mallard-based docs.

https://bugzilla.gnome.org/show_bug.cgi?id=621134

GNOME/banshee,allquixotic/banshee-gst-sharp-work,GNOME/banshee,allquixotic/banshee-gst-sharp-work,dufoli/banshee,allquixotic/banshee-gst-sharp-work,babycaseny/banshee,directhex/banshee-hacks,allquixotic/banshee-gst-sharp-work,directhex/banshee-hacks,Dynalon/banshee-osx,mono-soc-2011/banshee,GNOME/banshee,directhex/banshee-hacks,stsundermann/banshee,Dynalon/banshee-osx,directhex/banshee-hacks,ixfalia/banshee,ixfalia/banshee,lamalex/Banshee,petejohanson/banshee,ixfalia/banshee,dufoli/banshee,dufoli/banshee,petejohanson/banshee,Dynalon/banshee-osx,arfbtwn/banshee,ixfalia/banshee,mono-soc-2011/banshee,ixfalia/banshee,stsundermann/banshee,allquixotic/banshee-gst-sharp-work,Dynalon/banshee-osx,Carbenium/banshee,lamalex/Banshee,babycaseny/banshee,babycaseny/banshee,mono-soc-2011/banshee,directhex/banshee-hacks,mono-soc-2011/banshee,GNOME/banshee,Carbenium/banshee,Carbenium/banshee,Dynalon/banshee-osx,arfbtwn/banshee,GNOME/banshee,arfbtwn/banshee,lamalex/Banshee,lamalex/Banshee,stsundermann/banshee,ixfalia/banshee,arfbtwn/banshee,directhex/banshee-hacks,GNOME/banshee,stsundermann/banshee,GNOME/banshee,stsundermann/banshee,GNOME/banshee,stsundermann/banshee,babycaseny/banshee,babycaseny/banshee,petejohanson/banshee,dufoli/banshee,dufoli/banshee,petejohanson/banshee,dufoli/banshee,Carbenium/banshee,petejohanson/banshee,Dynalon/banshee-osx,babycaseny/banshee,dufoli/banshee,mono-soc-2011/banshee,ixfalia/banshee,arfbtwn/banshee,mono-soc-2011/banshee,allquixotic/banshee-gst-sharp-work,Carbenium/banshee,babycaseny/banshee,Dynalon/banshee-osx,stsundermann/banshee,Carbenium/banshee,lamalex/Banshee,dufoli/banshee,arfbtwn/banshee,ixfalia/banshee,arfbtwn/banshee,petejohanson/banshee,babycaseny/banshee,Dynalon/banshee-osx,stsundermann/banshee,mono-soc-2011/banshee,arfbtwn/banshee,lamalex/Banshee