fix window buttons in "multi-window" mode

src/widget/form/genericchatform.cpp

@@ -46,7 +46,7 @@
 #include <QPushButton>
 
 GenericChatForm::GenericChatForm(QWidget *parent)
-  : QWidget(parent)
+  : QWidget(parent, Qt::Window)
   , audioInputFlag(false)
   , audioOutputFlag(false)
 {

src/widget/form/settingswidget.cpp

@@ -32,7 +32,7 @@
 #include <QWindow>
 
 SettingsWidget::SettingsWidget(QWidget* parent)
-    : QWidget(parent)
+    : QWidget(parent, Qt::Window)
 {
     body = new QWidget();
     QVBoxLayout* bodyLayout = new QVBoxLayout();