Prevent zsh completion crash from special-char page names

[SkyR0ver]

Pressing Tab after tldr in zsh crashes the completion instead of listing pages when the verbose style is enabled (e.g. zimfw sets zstyle ':completion:*' verbose yes).

(eval):2535: parse error near `}
_describe:compdescribe:122: invalid argument: _a_11
_describe:compdescribe:129: no parsed state

The reason is that shtab zsh preamble fed the raw tldr --list output (which includes a page literally named }) to _describe as a single "(...)" string.

shtab_tldr_cmd_list(){
  _describe 'command' "($("/usr/bin/python3" -m tldr --list))"
}

zsh's _describe evals such strings unquoted as array literals, so the } breaks parsing and the completion dies.

This PR fixed the issue by splitting the page list into a real array with ${(@f...)} before passing it to _describe.