device: use "new-activation" reason when deactivating for another activation

"user-requested" has a side effect of disabling autoconnect.

Fixes: 600489003f

src/devices/nm-device.c

@@ -5956,7 +5956,7 @@ nm_device_queue_activation (NMDevice *self, NMActRequest *req)
 		_LOGI (LOGD_DEVICE, "disconnecting for new activation request.");
 		nm_device_state_changed (self,
 		                         NM_DEVICE_STATE_DEACTIVATING,
-		                         NM_DEVICE_STATE_REASON_USER_REQUESTED);
+		                         NM_DEVICE_STATE_REASON_NEW_ACTIVATION);
 	}
 }