fix(eslint): do not flush existing errors on changing file

[fi3ework]

fix #54

[codecov-commenter]

Codecov Report

Merging #55 (7e87c5e) into main (9e46176) will decrease coverage by 0.77%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
- Coverage   35.01%   34.24%   -0.78%     
==========================================
  Files          13       13              
  Lines         574      587      +13     
  Branches      117      118       +1     
==========================================
  Hits          201      201              
- Misses        372      385      +13     
  Partials        1        1              

Impacted Files	Coverage Δ
packages/vite-plugin-checker/src/Checker.ts	89.28% <ø> (ø)
...es/vite-plugin-checker/src/checkers/eslint/main.ts	0.00% <0.00%> (ø)

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