multituner: disable howtswitch on FBC tuners

As reported from @Ims, it seems there is an issue using FBC DVB-C/T tuner as hotswitch.

lib/python/Components/NimManager.py

@@ -518,7 +518,7 @@ def __init__(self, slot, type, description, has_outputs = True, internally_conne
 				types.remove("DVB-S")
 			if len(types) > 1:
 				self.multi_type = {}
-				self.hotswitchable = not os.path.exists("/proc/stb/frontend/%d/mode" % self.frontend_id)
+				self.hotswitchable = not (os.path.exists("/proc/stb/frontend/%d/mode" % self.frontend_id) or self.isFBCTuner())
 				for type in types:
 					self.multi_type[str(types.index(type))] = type