Qml Live Preview: Update the QmlJSLiveTextPreview When the document is reloaded.

When the document is reloaded by the server, we need to refresh
refresh what was the loaded document, and refresh the debugIds

src/plugins/qmljsinspector/qmljsdesigndebugclient.cpp

@@ -96,6 +96,8 @@ void QmlJSDesignDebugClient::messageReceived(const QByteArray &message)
         bool inDesignMode;
         ds >> inDesignMode;
         emit designModeBehaviorChanged(inDesignMode);
+    } else if (type == "RELOADED") {
+        emit reloaded();
     }
 }