cli/parser: depopulate commands' internal args lists

[EricFromCanada]

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Each command's args was including both options and their descriptions. This trims them down to including just short and long options.

Before: (for e.g. brew --cache's args)

==> #<Homebrew::CLI::Args named=[], remaining=[], d?=true, debug?=true, Display any debugging information.?=false, q?=false, quiet?=false, Make some output more quiet.?=false, v?=false, verbose?=false, Make some output more verbose.?=false, ...

After:

==> #<Homebrew::CLI::Args named=[], remaining=[], d?=true, debug?=true, q?=false, quiet?=false, v?=false, verbose?=false, h?=false, help?=false, os=nil, arch=nil, s?=false, build_from_source?=false, force_bottle?=false, bottle_tag=nil, HEAD?=false, formula?=false, formulae?=false, cask?=false, casks?=false>

[apainintheneck]

How did you find this?

[MikeMcQuaid]

Thanks again @EricFromCanada!

[EricFromCanada]

How did you find this?

Accidentally while odebugging for another issue.