Simplify weboob connector to support only one backend
Simplify weboob connector to support only one backend

bnjbvr/kresus,bnjbvr/kresus,bnjbvr/kresus,ZeHiro/kresus,ZeHiro/kresus,ZeHiro/kresus,ZeHiro/kresus,bnjbvr/kresus