Debugger: Conceptually fix temporary stop of mixed gdb+qml engine

There's no actual change, the code could only be triggered when
the gdb side was active, but it triggered a stop of the combo
which then redirected to the active one.

It's always and only the gdb side that needs stopping, so do
it directly.

Change-Id: I1a6273b826be8f38993c9968d874b7b3daf0d0c7
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/gdb/gdbengine.cpp

@@ -757,7 +757,7 @@ void GdbEngine::runCommand(const DebuggerCommand &command)
         if (state() == InferiorRunOk) {
             showStatusMessage(tr("Stopping temporarily."), 1000);
             m_onStop.append(cmd, wantContinue);
-            requestInterruptInferior();
+            interruptInferior();
             return;
         }
         if (state() != InferiorStopOk)