Fix login dialog causing main window to be non movable (#4121)

Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>
fixes https://github.com/Chatterino/chatterino2/issues/2378

src/widgets/settingspages/AccountsPage.cpp

@@ -33,10 +33,8 @@ AccountsPage::AccountsPage()
     view->getTableView()->horizontalHeader()->setStretchLastSection(true);
 
     view->addButtonPressed.connect([this] {
-        static auto loginWidget = new LoginWidget(this);
-
-        loginWidget->show();
-        loginWidget->raise();
+        LoginDialog d(this);
+        d.exec();
     });
 
     view->getTableView()->setStyleSheet("background: #333");