connectivity: clear public ip in cache on connectivityChanged

publishedIpAddress_ should be cleared to avoid to create ICE
transports with an old public ip address.

Change-Id: I22bba4dfd6e98fdc950dea77d5732e371ba8ade2

src/jamidht/jamiaccount.cpp

@@ -2769,6 +2769,7 @@ JamiAccount::connectivityChanged()
     }
 
     dht_.connectivityChanged();
+    setPublishedAddress({}); // reset cache
 }
 
 bool