fix: duplicated findStaticChild process at findChildWithLabel

[lkeix]

duplicated findStaticChild process at findChildWithLabel in router.go

I think less duplicate processing more readable except performance decrement.

[codecov]

Codecov Report

Merging #2176 (609021d) into master (6df1c35) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2176   +/-   ##
=======================================
  Coverage   92.20%   92.20%           
=======================================
  Files          37       37           
  Lines        3090     3090           
=======================================
  Hits         2849     2849           
  Misses        151      151           
  Partials       90       90           

Impacted Files	Coverage Δ
router.go	96.50% <100.00%> (ø)

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