yuzu/game_list_worker: Don't retrieve the file type twice in AddFstEntriesToGameList()

Similarly, here we can avoid doing unnecessary work twice by retrieving
the file type only once and comparing it against relevant operands,
avoiding potential unnecessary object construction/destruction.

src/yuzu/game_list_worker.cpp

@@ -198,12 +198,16 @@ void GameListWorker::AddFstEntriesToGameList(const std::string& dir_path, unsign
         const bool is_dir = FileUtil::IsDirectory(physical_name);
         if (!is_dir &&
             (HasSupportedFileExtension(physical_name) || IsExtractedNCAMain(physical_name))) {
-            std::unique_ptr<Loader::AppLoader> loader =
-                Loader::GetLoader(vfs->OpenFile(physical_name, FileSys::Mode::Read));
-            if (!loader || ((loader->GetFileType() == Loader::FileType::Unknown ||
-                             loader->GetFileType() == Loader::FileType::Error) &&
-                            !UISettings::values.show_unknown))
+            auto loader = Loader::GetLoader(vfs->OpenFile(physical_name, FileSys::Mode::Read));
+            if (!loader) {
                 return true;
+            }
+
+            const auto file_type = loader->GetFileType();
+            if ((file_type == Loader::FileType::Unknown || file_type == Loader::FileType::Error) &&
+                !UISettings::values.show_unknown) {
+                return true;
+            }
 
             std::vector<u8> icon;
             const auto res1 = loader->ReadIcon(icon);