Fix hook filter display issue for backup describer

[allenxu404]

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Please add a summary of your change

Backup describer displays hook filter specified in backup hook spec rather than backup spec

Does your change fix a particular issue?

Fixes #6043

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• Updated the corresponding documentation in site/content/docs/main.

[codecov-commenter]

Codecov Report

Merging #6434 (75833ea) into main (de83980) will increase coverage by 1.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #6434      +/-   ##
==========================================
+ Coverage   58.41%   59.66%   +1.24%     
==========================================
  Files         227      227              
  Lines       23771    23771              
==========================================
+ Hits        13887    14182     +295     
+ Misses       8899     8603     -296     
- Partials      985      986       +1     

Impacted Files	Coverage Δ
pkg/cmd/util/output/backup_describer.go	55.69% <100.00%> (ø)
pkg/cmd/util/output/backup_structured_describer.go	61.11% <100.00%> (ø)

... and 7 files with indirect coverage changes