rust/src/filecontainer.rs: fix double implementation of Default on struct FileContainer

[linuxhunter]

…ruct FileContainer

Make sure these boxes are signed before submitting your Pull Request -- thank you.

• [x] I have read the contributing guide lines at https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Contributing
• [x] I have signed the Open Information Security Foundation contribution agreement at https://suricata.io/about/contribution-agreement/
• [x] I have updated the user guide (in doc/userguide/) to reflect the changes made (if applicable)

Link to redmine ticket:

Describe changes:

#suricata-verify-pr: #suricata-verify-repo: #suricata-verify-branch: #suricata-update-pr: #suricata-update-repo: #suricata-update-branch: #libhtp-pr: #libhtp-repo: #libhtp-branch:

[codecov[bot]]

Codecov Report

Merging #7712 (ec651c4) into master (debdff0) will decrease coverage by 0.00%. The diff coverage is n/a.

:exclamation: Current head ec651c4 differs from pull request most recent head 2062104. Consider uploading reports for the commit 2062104 to get more accurate results

@@            Coverage Diff             @@
##           master    #7712      +/-   ##
==========================================
- Coverage   75.99%   75.99%   -0.01%     
==========================================
  Files         660      660              
  Lines      185705   185706       +1     
==========================================
- Hits       141127   141119       -8     
- Misses      44578    44587       +9     

Flag	Coverage Δ
fuzzcorpus	60.70% <ø> (+0.01%)	:arrow_up:
suricata-verify	52.57% <ø> (+<0.01%)	:arrow_up:
unittests	60.71% <ø> (-0.01%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.