Move Death Link change tag to Common Client

CommonClient.py

@@ -315,6 +315,15 @@ class CommonContext():
             self.input_requests -= 1
         self.keep_alive_task.cancel()
 
+    async def update_death_link(self, death_link):
+        old_tags = self.tags.copy()
+        if death_link:
+            self.tags.add("DeathLink")
+        else:
+            self.tags -= {"DeathLink"}
+        if old_tags != self.tags and self.server and not self.server.socket.closed:
+            await self.send_msgs([{"cmd": "ConnectUpdate", "tags": self.tags}])
+
 
 async def keep_alive(ctx: CommonContext, seconds_between_checks=100):
     """some ISPs/network configurations drop TCP connections if no payload is sent (ignore TCP-keep-alive)