Debugger: Do not remember persistent layout settings per engine

Fixes: QTCREATORBUG-21006
Change-Id: Id3c2062eb5b42808d666f0fc3620a82666fe14a2
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/debugger/qml/qmlengine.cpp

@@ -259,7 +259,7 @@ QmlEngine::QmlEngine()
   :  d(new QmlEnginePrivate(this, new QmlDebugConnection(this)))
 {
     setObjectName("QmlEngine");
-    setDebuggerName(tr("QML Debugger"));
+    setDebuggerName("QML");
 
     QmlDebugConnection *connection = d->connection();