Debugger: Fix some perspective selection issue

Previously:
   - start combined debugging, stop anywhere
   - switch to QML debugger sub-perspective
   - switch to any other analyzer main perspective
   - switch back to debugger main perspective
->  QML debugger was selected in the sub-perspective chooser combobox,
but the visible views were the ones of the the C++ debugger.

With this patch, the visible views match the selected QML debugger.

Change-Id: I20e4bd6c07acb5e55c02f0a0ef042986f2e3f1f4
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/debuggerengine.cpp

@@ -554,7 +554,7 @@ void DebuggerEnginePrivate::setupViews()
 
     QTC_CHECK(!m_perspective);
 
-    m_perspective = new Perspective("Debugger.Perspective." + m_runId,
+    m_perspective = new Perspective("Debugger.Perspective." + m_runId + '.' + m_debuggerName,
                                     m_engine->displayName(),
                                     Debugger::Constants::PRESET_PERSPECTIVE_ID,
                                     m_debuggerName);