Debugger: Simplify use of DebuggerEnginePrivate members

Each engine has now the RunTool pointer, not just the master.

Change-Id: I6bab026998d5da5da82224bfaf4a93d3cfb3a898
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/qml/qmlengine.cpp

@@ -334,7 +334,7 @@ void QmlEngine::handleLauncherStarted()
 {
     // FIXME: The QmlEngine never calls notifyInferiorPid() triggering the
     // raising, so do it here manually for now.
-    runControl()->applicationProcessHandle().activate();
+    runTool()->runControl()->applicationProcessHandle().activate();
     tryToConnect();
 }