fix remove the field writer which only differ in first character that one is upper case the other is lower case

[yanxutao89]

What this PR does / why we need it?

fix remove the field writer which only differ in first character that one is upper case the other is lower case

Summary of your change

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 61.11111% with 7 lines in your changes missing coverage. Please review.

Project coverage is 72.66%. Comparing base (f6cdd54) to head (fdb4e06).
Report is 58 commits behind head on main.

Files with missing lines	Patch %	Lines
.../alibaba/fastjson2/writer/ObjectWriterCreator.java	55.55%	1 Missing and 3 partials ⚠️
...ibaba/fastjson2/writer/ObjectWriterCreatorASM.java	66.66%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3222      +/-   ##
============================================
- Coverage     74.27%   72.66%   -1.61%     
+ Complexity    23542    22865     -677     
============================================
  Files           659      668       +9     
  Lines         91870    92079     +209     
  Branches      20539    20509      -30     
============================================
- Hits          68238    66912    -1326     
- Misses        15240    16591    +1351     
- Partials       8392     8576     +184     

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[wenshao]

没有单测？