Retire fix1781 amendment

[pratikmankawde]

High Level Overview of Change

This change retires the fix1781 amendment.

Context of Change

Amendments activated for more than 2 years can be retired.
https://xrpl.org/resources/known-amendments#fix1781

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

[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.3%. Comparing base (1dd6024) to head (e35d865).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/xrpld/app/paths/detail/XRPEndpointStep.cpp	40.0%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #5931     +/-   ##
=========================================
- Coverage     78.3%   78.3%   -0.0%     
=========================================
  Files          817     817             
  Lines        68980   68978      -2     
  Branches      8329    8324      -5     
=========================================
- Hits         54021   54017      -4     
- Misses       14959   14961      +2     

Files with missing lines	Coverage Δ
src/xrpld/app/paths/detail/XRPEndpointStep.cpp	83.3% <40.0%> (+0.5%)	⬆️

... and 2 files with indirect coverage changes

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