[patch] Fix issue where zsh global aliases break nvm help

[AllySummers]

Fix issue with the color codes in the nvm help text where short shell aliases would display an inline error in the nvm help text.

Given a zsh alias such as:

alias -g C='| clipcopy'

This would cause an issue with the nvm --help text, where the colour code function would have an unquoted 'C' and therefore print an error to the console and silently continue. I have attached a screenshot of what it looks like with this update and what it looks like before

[ljharb]

this is a fine change, but to be clear it's not "short" aliases, it's only zsh's global aliases which do this (and are a very bad idea as a result).

[ljharb]

This is fine, but it'd be really nice to have a zsh-only regression test to check for this.

[AllySummers]

I'll see if I can do that maybe over the weekend or early to mid next week!

If I have forgotten, you're welcome to ping me.

Thanks for the quick review!

[ljharb]

@AllySummers i'm going to merge this shortly, and I would really appreciate a follow-up PR to add a test for zsh global aliases :-)