refs #511 Fix window modality

Both CPluginDetailsWindow and CPluginConfigWindow have window modality set.

src/blackgui/pluginconfigwindow.cpp

@@ -7,7 +7,7 @@ namespace BlackGui {
 
     CPluginConfigWindow::CPluginConfigWindow(QWidget *parent) : QWidget(parent, Qt::Window)
     {
-
+        setWindowModality(Qt::WindowModal);
     }
 
     void CPluginConfigWindow::showEvent(QShowEvent *event)

src/blackgui/plugindetailswindow.cpp

@@ -21,6 +21,8 @@ namespace BlackGui
     {
         ui->setupUi(this);
 
+        setWindowModality(Qt::WindowModal);
+
         QFont font = ui->lbl_PluginName->font();
         font.setPointSize(font.pointSize() + 2);
         ui->lbl_PluginName->setFont(font);