Lastfm: remove useless (and unused) automatic properties in LastfmRequest
Lastfm: remove useless (and unused) automatic properties in LastfmRequest

Someone really failed at adding properties here because:
- They don't wrap the fields they are meant to wrap.
- Therefore, they are never assigned any value.
- They are never used, internally or externally.
- If they were wrapping any value, their public setter would make the
object a bit more mutable, which is bad.

All in all, I'm removing them. I could have removed the fields instead
and start using these, but if there's external code using them, what's
the use case really?

No change of behaviour in this commit.

ixfalia/banshee,babycaseny/banshee,ixfalia/banshee,GNOME/banshee,dufoli/banshee,Dynalon/banshee-osx,babycaseny/banshee,ixfalia/banshee,GNOME/banshee,dufoli/banshee,dufoli/banshee,ixfalia/banshee,dufoli/banshee,babycaseny/banshee,GNOME/banshee,Carbenium/banshee,Dynalon/banshee-osx,stsundermann/banshee,dufoli/banshee,stsundermann/banshee,arfbtwn/banshee,GNOME/banshee,Dynalon/banshee-osx,stsundermann/banshee,Carbenium/banshee,arfbtwn/banshee,stsundermann/banshee,GNOME/banshee,dufoli/banshee,ixfalia/banshee,Carbenium/banshee,stsundermann/banshee,GNOME/banshee,Carbenium/banshee,GNOME/banshee,Carbenium/banshee,dufoli/banshee,babycaseny/banshee,GNOME/banshee,arfbtwn/banshee,arfbtwn/banshee,ixfalia/banshee,Carbenium/banshee,dufoli/banshee,ixfalia/banshee,babycaseny/banshee,Dynalon/banshee-osx,arfbtwn/banshee,Dynalon/banshee-osx,Dynalon/banshee-osx,Dynalon/banshee-osx,Dynalon/banshee-osx,stsundermann/banshee,arfbtwn/banshee,babycaseny/banshee,arfbtwn/banshee,stsundermann/banshee,babycaseny/banshee,babycaseny/banshee,ixfalia/banshee,stsundermann/banshee,arfbtwn/banshee