[bin] meshroom_batch: Stop using removed defaultCacheFolder

[cbentejac]

Description

Following the removal of meshroom.core.defaultCacheFolder in #2703, this PR removes it fully from meshroom_batch, which kept on using it as the default value for the --cache option. Instead, "" is used as a default value, as it is in meshroom.core.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.75%. Comparing base (006288a) to head (5afd2c1).
Report is 2 commits behind head on develop.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2715   +/-   ##
========================================
  Coverage    76.75%   76.75%           
========================================
  Files           40       40           
  Lines         6082     6082           
========================================
  Hits          4668     4668           
  Misses        1414     1414           

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