Merge PR 'Use the text from modinfo.txt as the mod menu entry'

Merge PR 'Use the text from modinfo.txt as the mod menu entry'

Copies the text from the `modinfo.txt` into the name field for the mod
list entry. If there is no text the mod directory name is used as
before.

![image](https://github.com/DarkPlacesEngine/darkplaces/assets/424218/b6b5da57-7590-407e-920c-21bca23ef2bb)

Fixes Alkaline 1.2 failing to appear in the mod list (its dir is
`alk1.2`).

See https://github.com/DarkPlacesEngine/darkplaces/pull/168

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Signed-off-by: bones_was_here <bones_was_here@xonotic.au>
Co-authored-by: bones_was_here <bones_was_here@xonotic.au>