Fix tests for verify_phpunit_xml after MDL-83424

[ziegenberg]

Because of the move to public with the changes in MDL-83424, test 2, which runs on the main branch, needed some adjusting for the extra public at the beginning of the file paths.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 24.42%. Comparing base (c1677c0) to head (d4acfc0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #364      +/-   ##
==========================================
- Coverage   25.22%   24.42%   -0.80%     
==========================================
  Files          72       72              
  Lines        3271     3271              
==========================================
- Hits          825      799      -26     
- Misses       2446     2472      +26     

Flag	Coverage Δ
check_upgrade_savepoints	0.45% <ø> (ø)
checkstyle_manipulations	0.00% <ø> (ø)
compare_databases	2.35% <ø> (ø)
continuous_manage_queues_validation	1.37% <ø> (ø)
define_excluded	1.10% <ø> (ø)
detect_conflicts	1.46% <ø> (ø)
diff_extract_changes	0.00% <ø> (ø)
git_sync_two_branches	?
grunt_process	2.96% <ø> (ø)
illegal_whitespace	2.59% <ø> (ø)
list_valid_components	0.00% <ø> (ø)
mustache_lint	2.81% <ø> (ø)
mustache_lint_plugins	1.31% <ø> (ø)
php_lint	1.22% <ø> (ø)
prepare_npm_stuff	1.49% <ø> (ø)
remote_branch_reporter	0.00% <ø> (ø)
setup	0.00% <ø> (ø)
thirdparty_check	1.55% <ø> (ø)
travis-branch-checker	0.00% <ø> (ø)
upgrade_external_backup	1.62% <ø> (ø)
verifications	0.00% <ø> (ø)
verify_commit_messages	2.59% <ø> (ø)
verify_phpunit_xml	1.22% <ø> (?)
versions_check_set	5.13% <ø> (ø)

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