Skip restoration of undesirable preload feature

[ben-grande]

For: QubesOS/qubes-issues#1512

---

Untested and might be superseded by:

• Skip backup of undesirable preload feature qubes-core-admin#720

Is there a reason for the restore utility to enforce this seeing the PR above? I can't find one, closing.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 76.10%. Comparing base (8aaef4c) to head (d88aef9).

Files with missing lines	Patch %	Lines
qubesadmin/backup/restore.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #379      +/-   ##
==========================================
- Coverage   76.13%   76.10%   -0.03%     
==========================================
  Files          53       53              
  Lines        9222     9224       +2     
==========================================
- Hits         7021     7020       -1     
- Misses       2201     2204       +3     

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