Fix typo that resulted in "Run in background" appearing in wrong section (#851/2)

GUI/View/Project/SimulationView.cpp

@@ -109,7 +109,7 @@ SimulationView::SimulationView(QWidget* parent, ProjectDocument* document)
     l3->addWidget(m_runPolicyImmediatelyRadio);
     m_runPolicyBackgroundRadio = new QRadioButton("Run in background");
     b_exec->addButton(m_runPolicyBackgroundRadio);
-    l2->addWidget(m_runPolicyBackgroundRadio);
+    l3->addWidget(m_runPolicyBackgroundRadio);
     l3->addSpacerItem(new QSpacerItem(10, 10));
 
     // number of threads