[qt_common] Avoid FS factory refresh while powered

Skip FileSystemController factory recreation during game-list repopulation while emulation is powered on.

This avoids poking live FS/VFS state during homebrew self-update and in-place NextLoad flows.

src/qt_common/game_list/model.cpp

@@ -159,7 +159,9 @@ void GameListModel::RemoveFavorite(u64 program_id) {
 
 void GameListModel::Repopulate() {
     current_worker.reset();
-    QtCommon::system->GetFileSystemController().CreateFactories(*QtCommon::vfs);
+    if (!QtCommon::system->IsPoweredOn()) {
+        QtCommon::system->GetFileSystemController().CreateFactories(*QtCommon::vfs);
+    }
     PopulateAsync(UISettings::values.game_dirs);
 }