Fix test/gmtest.in so that subplot-l2s.sh and inset-l2s.sh pass

[seisman]

subplot-l2s.sh and inset-l2s.sh fail because these scripts have gmt begin but don't produce any PS files. Thus pscmp function in gmtest exits with an error.

This PR fixes it by checking pattern gmt begin figname rather than gmt begin.

Closes #8344.

[joa-quim]

It still fails for me on Windows

[seisman]

It still fails for me on Windows

What's the output if you run grep -c "gmt begin .*\| -ps \| -view " test/subplot/subplot-l2s.sh?

[joa-quim]

C:\v\build>grep -c "gmt begin .*\| -ps \| -view " test/subplot/subplot-l2s/subplot-l2s.sh
0

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.46%. Comparing base (4cb3ca7) to head (e887545).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8430      +/-   ##
==========================================
- Coverage   50.49%   50.46%   -0.04%     
==========================================
  Files         262      262              
  Lines      189043   189043              
  Branches    43645    43649       +4     
==========================================
- Hits        95461    95401      -60     
- Misses      77023    77064      +41     
- Partials    16559    16578      +19     

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[joa-quim]

Thanks, it works now.