Retired fix1543 amendment

[pratikmankawde]

High Level Overview of Change

This change retires the fix1543 amendment.

Context of Change

Amendments activated for more than 2 years can be retired.
https://xrpl.org/resources/known-amendments#fix1543

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.5%. Comparing base (e192ffe) to head (d98a3f0).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5926   +/-   ##
=======================================
  Coverage     78.5%   78.5%           
=======================================
  Files          817     817           
  Lines        69017   69007   -10     
  Branches      8276    8268    -8     
=======================================
+ Hits         54197   54200    +3     
+ Misses       14820   14807   -13     

Files with missing lines	Coverage Δ
src/xrpld/app/tx/detail/Escrow.cpp	99.2% <ø> (-<0.1%)	⬇️
src/xrpld/app/tx/detail/Escrow.h	100.0% <ø> (ø)
src/xrpld/app/tx/detail/PayChan.cpp	96.3% <100.0%> (-0.1%)	⬇️
src/xrpld/app/tx/detail/PayChan.h	100.0% <ø> (ø)

... and 4 files with indirect coverage changes

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[bthomee]

@pratikmankawde there's a conflict - can you please resolve it first? I'd also like to get a sign-off from @a1q123456 before merging.

[pratikmankawde]

@pratikmankawde there's a conflict - can you please resolve it first? I'd also like to get a sign-off from @a1q123456 before merging.

Done

[bthomee]

@pratikmankawde There are some linking errors due to removing some of the getFlagsMask overrides - I'm sure it's an easy fix.