Regression of PR#358

[jorgeyanesdiez]

Exactly the same problem fixed by PR#358 has happened again. And the same fix applies again.
Simply rebasing the commit and merging it again will fix the issue but, clearly it's not a long term solution.
Can we do something as suggested by @wez ? Is tools/update_all.py the correct location for a possible check/fix?

[mbadolato]

I haven't looked. It's either the update_all script, or the individual convert scripts may need to be told not to change the names to lowercase etc

[jdhmtl]

The files that standout from #357 appear to be matrix, darkmatrix, and darkermatrix. These are all lower case in the schemes directory, which I believe to be the source of truth. That being so, wouldn't the capitalized copies in the alacritty and vscode directories be incorrect? Would deleting those make the problem go away? Conversion scripts appear to be respecting casing, best I can tell.