[Feature Request] Option to Make Thumbnails Search by Label Before Filename

Originally, RetroArch would search for and display thumbnails based on the label first, and then, if a match was not found, it would search by filename. However, this behavior was changed to prioritize filename searching by default.

I would like to request an option to add a setting that allows thumbnails to be searched by label first, as it was before. This would be especially useful in scenarios where a game has been modded (Be it music, a recolor, a translation , etc.) but you also want it to use the same save file as the unmodded/original game (For which, the actual ROM filename would be the same). In such cases, the save file would still match due to the identical filenames, and the label becomes the distinguishing factor between the original and modded versions.

Allowing the label to take priority in the thumbnail search would make it much easier to differentiate these games by their respective thumbnails while using the same save file if desired. Please consider adding this option to enhance flexibility for users with modded games/romhacks.

The issue names no files, tests, or entry points; begin by locating RetroArch's thumbnail search and settings code. Done means users can enable an option that searches by label first and falls back to filename search, while preserving the described save-file behavior.