Add missing parent pointer to few QMessageBox and QFontDialog (#3679)

Co-authored-by: Felanbird <41973452+Felanbird@users.noreply.github.com>
Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/widgets/settingspages/GeneralPage.cpp

@@ -735,10 +735,8 @@ QString GeneralPage::getFont(const DropdownArgs &args) const
         args.combobox->setEditText("Choosing...");
         QFontDialog dialog(getApp()->fonts->getFont(FontStyle::ChatMedium, 1.));
 
-        dialog.setWindowFlag(Qt::WindowStaysOnTopHint);
-
         auto ok = bool();
-        auto font = dialog.getFont(&ok);
+        auto font = dialog.getFont(&ok, this->window());
 
         if (ok)
             return font.family();