Correct CLI argument hint for PHPStan

[Murl080]

Without the equals sign, I got the following error using PHPStan v1.12.4:

The "--error-format checkstyle" option does not exist.  

analyse [-c|--configuration CONFIGURATION] [-l|--level LEVEL] [--no-progress] [--debug] [-a|--autoload-file AUTOLOAD-FILE] [--error-format ERROR-FORMAT] [-b|--generate-baseline [GENERATE-BASELINE]] [--allow-empty-baseline] [--memory-limit MEMORY-LIMIT] [--xdebug] [--fix] [--watch] [--pro] [--fail-without-result-cache] [--] [<paths>...]

Testing done

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.57%. Comparing base (5a1eb90) to head (7136eeb).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1856      +/-   ##
============================================
- Coverage     82.66%   82.57%   -0.10%     
+ Complexity     1362     1360       -2     
============================================
  Files           249      249              
  Lines          5233     5233              
  Branches        402      402              
============================================
- Hits           4326     4321       -5     
- Misses          798      802       +4     
- Partials        109      110       +1     

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[uhafner]

Thanks for spotting!