Revert no TURN servers event

The intended flow has changed so we prompt about this case in context of making
a call, so this event is no longer needed.

src/client.js

@@ -4360,9 +4360,6 @@ function checkTurnServers(client) {
             client._checkTurnServersTimeoutID = setTimeout(() => {
                 checkTurnServers(client);
             }, (res.ttl || (60 * 60)) * 1000 * 0.9);
-        } else {
-            logger.warn("No TURN URIs from homeserver");
-            client.emit("Call.noTURNServers");
         }
     }, function(err) {
         logger.error("Failed to get TURN URIs");