fix: remove hex-ir from format cli options list

[engn33r]

What I did

Removed hex-ir from CLI help text. The option is available with the --hex-ir flag. A similar change was made to remove the duplicate no-optimize and no-bytecode-metadata cli format options here.

How I did it

How to verify it

Commit message

fix: remove hex-ir from format cli options

Description for the changelog

Remove redundant hex-ir from format cli options list

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[codecov-commenter]

Codecov Report

Merging #3657 (0955e2f) into master (ed0b1e0) will increase coverage by 0.39%.
Report is 6 commits behind head on master.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #3657      +/-   ##
==========================================
+ Coverage   89.14%   89.54%   +0.39%     
==========================================
  Files          85       80       -5     
  Lines       11364    11342      -22     
  Branches     2585     2553      -32     
==========================================
+ Hits        10131    10156      +25     
+ Misses        822      793      -29     
+ Partials      411      393      -18     

Files	Coverage Δ
vyper/cli/vyper_compile.py	60.97% <ø> (-2.61%)	⬇️

... and 14 files with indirect coverage changes

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