fix windows 404 for static files

[askuy]

clickvisual/clickvisual#91

golang/go#45230

[codecov]

Codecov Report

Merging #259 (b551aec) into master (055337e) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #259      +/-   ##
==========================================
- Coverage   61.15%   61.11%   -0.04%     
==========================================
  Files          77       77              
  Lines        2659     2659              
==========================================
- Hits         1626     1625       -1     
  Misses        866      866              
- Partials      167      168       +1     

Flag	Coverage Δ
unittests	61.11% <0.00%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
server/egin/component.go	63.75% <0.00%> (ø)
core/econf/conf.go	28.35% <0.00%> (-0.75%)	⬇️

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