fix(Field): should not adjust value when the min or max props are not set

[inottn]

fix #13149 fix #13154

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.61%. Comparing base (dcc008a) to head (c72ca19).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/vant/src/field/Field.tsx	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13150      +/-   ##
==========================================
- Coverage   89.73%   89.61%   -0.12%     
==========================================
  Files         257      257              
  Lines        7001     7002       +1     
  Branches     1730     1731       +1     
==========================================
- Hits         6282     6275       -7     
- Misses        378      382       +4     
- Partials      341      345       +4     

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