fix: correct file mime type validation parameter to restore functionality

[guqing]

What type of PR is this?

/kind bug
/area core
/milestone 2.20.x

What this PR does / why we need it:

修复文件上传时类型校验失效的问题

此问题由 #6390 导致

Does this PR introduce a user-facing change?

修复文件上传时类型校验失效的问题

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.

Project coverage is 58.14%. Comparing base (6cd8dc8) to head (9533d35).
Report is 85 commits behind head on main.

Files with missing lines	Patch %	Lines
...achment/endpoint/LocalAttachmentUploadHandler.java	0.00%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6673      +/-   ##
============================================
- Coverage     58.18%   58.14%   -0.04%     
- Complexity     3774     3942     +168     
============================================
  Files           651      679      +28     
  Lines         22125    23216    +1091     
  Branches       1538     1582      +44     
============================================
+ Hits          12873    13500     +627     
- Misses         8641     9092     +451     
- Partials        611      624      +13     

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[ruibaby]

/lgtm

[guqing]

/ping @halo-dev/sig-halo

[JohnNiang]

另外，有冲突需要解决。

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[JohnNiang]

/lgtm

[f2c-ci-robot]

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