UI: Call setWindowFlags before setupUi

For some reason this has a noticeable performance improvement,
presumably because Qt is notifying all the child widgets?

UI/window-basic-about.cpp

@@ -11,10 +11,10 @@ using namespace json11;
 
 OBSAbout::OBSAbout(QWidget *parent) : QDialog(parent), ui(new Ui::OBSAbout)
 {
-	ui->setupUi(this);
-
 	setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
 
+	ui->setupUi(this);
+
 	QString bitness;
 	QString ver;