fix: install.sh error 42 when selecting "all" from interactive menu

[mahdimahdieh]

Description

Please explain the changes you made here.

Requirements / Checklist

• Read the Contributing Guidelines
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan.
  Issue number where discussion took place: #xxx
• If this contains a font/glyph add its origin as background info below (e.g. URL)
• Verified the license of any newly added font, glyph, or glyph set. License is: xxx

---

• I did not use AI/LLM to create this PR, or
• I disclosed the tool/model below and reviewed its output. I did not attribute commits to AI and will answer maintainer questions and review comments myself without AI/LLM. Or
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What does this Pull Request (PR) do?

fix this issue: #2095

How should this be manually tested?

running ./install.sh install then 73 ("all")

Any background context you can provide?

No

What are the relevant tickets (if any)?

#2095

Screenshots (if appropriate or helpful)

[Finii]

Thanks for the PR, but it does not remove the real cause of the problem.

When we run select the user enters a number and that will be 'translated' to the original string of the select call - which is per definition one element of the font list (or "all").

All the lines are leftovers that need to be removed instead. See 539ef18

[Finii]

The select call will fill either one element of font_list or "all" or "" into font_name.
There is no need to check if font_name is a member of font_list

When writing this I noticed the code can be further improved: adbd16a