fix: fix slice init length

[cuishuang]

Checklist for submitter

The intention here should be to initialize a slice with a capacity of totalTitlesToProcess rather than initializing the length of this slice.

The only demo: https://go.dev/play/p/q1BcVCmvidW

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
  See Changes files for more information.
• Input data is properly validated, SELECT * is avoided, SQL injection is prevented (using placeholders for values in statements)
• Added support on fleet's osquery simulator cmd/osquery-perf for new osquery data ingestion features.
• Added/updated tests
• If paths of existing endpoints are modified without backwards compatibility, checked the frontend/CLI for any necessary changes
• If database migrations are included, checked table schema to confirm autoupdate
• For database migrations:
  • Checked schema for all modified table for columns that will auto-update timestamps during migration.
  • Confirmed that updating the timestamps is acceptable, and will not cause unwanted side effects.
  • Ensured the correct collation is explicitly set for character columns (COLLATE utf8mb4_unicode_ci).
• Manual QA for all new/changed functionality
• For Orbit and Fleet Desktop changes:
  • Orbit runs on macOS, Linux and Windows. Check if the orbit feature/bugfix should only apply to one platform (runtime.GOOS).
  • Manual QA must be performed in the three main OSs, macOS, Windows and Linux.
  • Auto-update manual QA, from released version of component to new version (see tools/tuf/test).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.13%. Comparing base (54f209d) to head (f17689c).
Report is 105 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #22608      +/-   ##
==========================================
+ Coverage   65.09%   65.13%   +0.03%     
==========================================
  Files        1498     1498              
  Lines      117134   117134              
  Branches     3535     3535              
==========================================
+ Hits        76247    76291      +44     
+ Misses      33801    33761      -40     
+ Partials     7086     7082       -4     

Flag	Coverage Δ
backend	66.39% <100.00%> (+0.04%)	⬆️

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[getvictor]

LGTM

[getvictor]

@cuishuang Thank you for finding this issue!