[submitters] Fix os.path.join for rez binary

[cbentejac]

Description

This PR makes a minor fix to the construction of the rezBin path in the rezWrapCommand function in meshroom/submitters/tractorSubmitter.py. The change corrects the path joining logic to prevent an incorrect file path.

• Fixed the path construction for rezBin by removing the leading slash from "/bin/rez" and changing it to "bin/rez", ensuring os.path.join produces the correct path. Otherwise, rezBin is erroneously set to "/bin/rez".

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.86%. Comparing base (6594215) to head (ee678a8).
⚠️ Report is 2 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2928   +/-   ##
========================================
  Coverage    80.86%   80.86%           
========================================
  Files           57       57           
  Lines         7792     7792           
========================================
  Hits          6301     6301           
  Misses        1491     1491           

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