Taxiway Sign Update

[rjison]

Remove single Hold display, set variable to control font.

[tidbyt]

⚠️ The automated review process is experimental and likely has bugs. Please bear with us as we iron out the kinks and enable you to ship changes at high velocity 🚀

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Automated Review Successful

Magical robots have reviewed your change and it looks good to go! 🤖

	Test	Details
✅	App Dir	All files are in a single app directory
✅	Modules	Only safe modules, without side-effects, are loaded
✅	Original Author	The original author matches the PR author