Use Qt's dialog where applicable (#1843)

src/widgets/splits/Split.cpp

@@ -57,7 +57,7 @@ namespace {
                            const QString &title, const QString &description)
     {
         auto window =
-            new BaseWindow(BaseWindow::Flags::EnableCustomFrame, parent);
+            new BasePopup(BaseWindow::Flags::EnableCustomFrame, parent);
         window->setWindowTitle("Chatterino - " + title);
         window->setAttribute(Qt::WA_DeleteOnClose);
         auto layout = new QVBoxLayout();

src/widgets/splits/SplitHeader.cpp

@@ -240,8 +240,8 @@ void SplitHeader::initializeLayout()
                             if (getSettings()->moderationActions.empty())
                             {
                                 getApp()->windows->showSettingsDialog(
-                                    SettingsDialogPreference::
-                                        ModerationActions);
+                                    this, SettingsDialogPreference::
+                                              ModerationActions);
                                 this->split_->setModerationMode(true);
                             }
                             else
@@ -258,6 +258,7 @@ void SplitHeader::initializeLayout()
                         case Qt::RightButton:
                         case Qt::MiddleButton:
                             getApp()->windows->showSettingsDialog(
+                                this,
                                 SettingsDialogPreference::ModerationActions);
                             break;
                     }