Fix leaked resource handles (partial PR2060)

src/activities/network/CalibreConnectActivity.cpp

@@ -55,6 +55,9 @@ void CalibreConnectActivity::onEnter() {
 void CalibreConnectActivity::onExit() {
   Activity::onExit();
 
+  stopWebServer();
+  MDNS.end();
+
   if (WiFi.getMode() != WIFI_MODE_NULL) {
     WiFi.disconnect(false);
     delay(30);