[stable10] Remove skeletondirectory setting from preseed-config.php

[phil-davis]

Description

These lines were removed in master PR #28603 and backport to stable10 #28610
They came back again accidentally in stable10 PR #28714

Remove them again - they are not in master and are not needed.

How Has This Been Tested?

CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[codecov]

Codecov Report

Merging #34930 into stable10 will decrease coverage by <.01%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             stable10   #34930      +/-   ##
==============================================
- Coverage       64.22%   64.22%   -0.01%     
  Complexity      19905    19905              
==============================================
  Files            1277     1277              
  Lines           76277    76276       -1     
  Branches         1292     1292              
==============================================
- Hits            48992    48991       -1     
  Misses          26906    26906              
  Partials          379      379

Flag	Coverage Δ	Complexity Δ
#javascript	53.2% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.39% <ø> (-0.01%)	19905 <ø> (ø)

Impacted Files	Coverage Δ	Complexity Δ
...eratedfilesharing/lib/Controller/OcmController.php	66.06% <0%> (-0.21%)	30% <0%> (ø)
lib/private/Server.php	86.53% <0%> (-0.12%)	253% <0%> (ø)
apps/files_trashbin/lib/Expiration.php	98.27% <0%> (+1.72%)	29% <0%> (ø)	⬇️

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