cmd/ls: Format ls style

[Prnyself]

fix #242

[codecov[bot]]

Codecov Report

Merging #248 into master will decrease coverage by 0.07%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #248      +/-   ##
==========================================
- Coverage   59.66%   59.59%   -0.08%     
==========================================
  Files          20       20              
  Lines         843      844       +1     
==========================================
  Hits          503      503              
- Misses        338      339       +1     
  Partials        2        2              

Impacted Files	Coverage Δ
cmd/qsctl/cp.go	40.00% <ø> (ø)
cmd/qsctl/ls.go	15.49% <0.00%> (-0.23%)	:arrow_down:
cmd/qsctl/mv.go	17.64% <ø> (ø)
cmd/qsctl/sync.go	28.20% <ø> (ø)
cmd/qsctl/tee.go	35.89% <ø> (ø)

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[Xuanwo]

LGTM