Removes sfCoverMinLiquidation field

[Tapanito]

High Level Overview of Change

Context of Change

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Performance (increase or change in throughput and/or latency)
• Tests (you added tests for code that already exists, or your new feature included in this PR)
• Documentation update
• Chore (no impact to binary, e.g. .gitignore, formatting, dropping support for older tooling)
• Release

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 79.4%. Comparing base (69dda6b) to head (ecd8a94).

Files with missing lines	Patch %	Lines
src/xrpld/app/tx/detail/InvariantCheck.cpp	75.0%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           release-3.1   #6282     +/-   ##
=============================================
- Coverage         79.4%   79.4%   -0.0%     
=============================================
  Files              839     839             
  Lines            71723   71712     -11     
  Branches          8257    8255      -2     
=============================================
- Hits             56921   56909     -12     
- Misses           14802   14803      +1     

Files with missing lines	Coverage Δ
include/xrpl/protocol/detail/ledger_entries.macro	100.0% <ø> (ø)
include/xrpl/protocol/detail/transactions.macro	100.0% <ø> (ø)
src/xrpld/app/tx/detail/LoanBrokerSet.cpp	95.1% <100.0%> (-0.3%)	⬇️
src/xrpld/app/tx/detail/LoanManage.cpp	89.2% <ø> (-0.1%)	⬇️
src/xrpld/app/tx/detail/InvariantCheck.cpp	92.3% <75.0%> (ø)

... and 1 file with indirect coverage changes

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