Booter: remove obsolete commented lines about Mono SGEN
Booter: remove obsolete commented lines about Mono SGEN

Mono ended up defaulting to SGEN for v3.2.x or higher, so we rather
simply let the underlying system decide.

arfbtwn/banshee,arfbtwn/banshee,babycaseny/banshee,GNOME/banshee,arfbtwn/banshee,ixfalia/banshee,stsundermann/banshee,stsundermann/banshee,Carbenium/banshee,GNOME/banshee,ixfalia/banshee,stsundermann/banshee,ixfalia/banshee,GNOME/banshee,stsundermann/banshee,Carbenium/banshee,GNOME/banshee,arfbtwn/banshee,arfbtwn/banshee,ixfalia/banshee,arfbtwn/banshee,GNOME/banshee,GNOME/banshee,ixfalia/banshee,GNOME/banshee,arfbtwn/banshee,Carbenium/banshee,Carbenium/banshee,babycaseny/banshee,babycaseny/banshee,Carbenium/banshee,stsundermann/banshee,stsundermann/banshee,babycaseny/banshee,babycaseny/banshee,babycaseny/banshee,Carbenium/banshee,ixfalia/banshee,stsundermann/banshee,babycaseny/banshee,GNOME/banshee,ixfalia/banshee,babycaseny/banshee,ixfalia/banshee,arfbtwn/banshee,stsundermann/banshee