Make page container hug edges of dialog <3

Signed-off-by: TheKodeToad <TheKodeToad@proton.me>

launcher/ui/dialogs/NewInstanceDialog.cpp

@@ -95,6 +95,7 @@ NewInstanceDialog::NewInstanceDialog(const QString& initialGroup,
     m_buttons = new QDialogButtonBox(QDialogButtonBox::Help | QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
 
     m_container = new PageContainer(this, {}, this);
+    m_container->useSidebarStyle(false);
     m_container->setSizePolicy(QSizePolicy::Policy::Preferred, QSizePolicy::Policy::Expanding);
     m_container->layout()->setContentsMargins(0, 0, 0, 0);
     ui->verticalLayout->insertWidget(2, m_container);