Prevent the dialogs to be hidden behind the main window

This also menas that when the main window is closed, the dialogs get
closed automatically, and not only when the map window is closed.

plugins/feature/map/mapgui.cpp

@@ -198,9 +198,9 @@ MapGUI::MapGUI(PluginAPI* pluginAPI, FeatureUISet *featureUISet, Feature *featur
     m_polygonMapModel(this),
     m_polylineMapModel(this),
     m_beacons(nullptr),
-    m_beaconDialog(this),
-    m_ibpBeaconDialog(this),
-    m_radioTimeDialog(this),
+    m_beaconDialog(this, this),
+    m_ibpBeaconDialog(this, this),
+    m_radioTimeDialog(this, this),
     m_cesium(nullptr),
     m_legend(nullptr),
     m_nasaWidget(nullptr),