Check permissions in LoanSet and LoanPay

[a1q123456]

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.1%. Comparing base (5224636) to head (6ff6be9).

Additional details and impacted files

@@                       Coverage Diff                        @@
##           ximinez/lending-XLS-66-ongoing   #6108     +/-   ##
================================================================
- Coverage                            79.1%   79.1%   -0.0%     
================================================================
  Files                                 839     839             
  Lines                               71370   71371      +1     
  Branches                             8322    8324      +2     
================================================================
- Hits                                56453   56452      -1     
- Misses                              14917   14919      +2     

Files with missing lines	Coverage Δ
src/xrpld/app/tx/detail/LoanPay.cpp	95.5% <100.0%> (+<0.1%)	⬆️
src/xrpld/app/tx/detail/LoanSet.cpp	91.4% <100.0%> (ø)

... and 1 file with indirect coverage changes

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[a1q123456]

Let me add a new test case for it. Making it a draft temporarily.

[a1q123456]

Actually, let me convert this pr to a draft again for a similar fix.