Fix dav URL for cases where user ID does not match username

[claucambra]

Should fix more LDAP issues

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 70.27027% with 22 lines in your changes missing coverage. Please review.

Project coverage is 76.55%. Comparing base (bb36e8e) to head (eba9666).
Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/NextcloudFileProviderKit/Item/Item.swift	0.00%	17 Missing ⚠️
...s/NextcloudFileProviderKitTests/AccountTests.swift	0.00%	4 Missing ⚠️
...s/NextcloudFileProviderKit/Utilities/Account.swift	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   76.49%   76.55%   +0.06%     
==========================================
  Files          38       38              
  Lines        8136     8174      +38     
==========================================
+ Hits         6224     6258      +34     
- Misses       1912     1916       +4     

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