do not create nilmods folder

"it cant be that easy" - me, clueless

Signed-off-by: kumquat-ir <66188216+kumquat-ir@users.noreply.github.com>

launcher/ui/pages/instance/ModFolderPage.cpp

@@ -280,5 +280,5 @@ NilModFolderPage::NilModFolderPage(BaseInstance* inst, std::shared_ptr<ModFolder
 
 bool NilModFolderPage::shouldDisplay() const
 {
-    return !m_model->dir().isEmpty();
+    return m_model->dir().exists();
 }