emergency-calls-manager: Add missing argument for on_origins_changed handler

The "removed" argument of the models "items-changed" signal was
forgotten making it misbehave when origins do get removed:

GLib-GObject[1287799]: WARNING: invalid (NULL) pointer instance
GLib-GObject[1287799]:CRITICAL: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

src/calls-emergency-calls-manager.c

@@ -44,7 +44,10 @@ on_emergency_numbers_changed (CallsEmergencyCallsManger *self)
 
 
 static void
-on_origins_changed (CallsEmergencyCallsManger *self, guint position, guint added)
+on_origins_changed (CallsEmergencyCallsManger *self,
+                    guint                      position,
+                    guint                      removed,
+                    guint                      added)
 {
   g_assert (CALLS_IS_EMERGENCY_CALLS_MANAGER (self));