Remove duplicate csv import in modules/csv/csv.go

[richmahn]

Remove the unnecessary duplicate package import for encoding/csv in modules/csv/csv.go

Fix #16557

[codecov-commenter]

Codecov Report

Merging #16631 (432d48c) into main (19e2c6a) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main   #16631   +/-   ##
=======================================
  Coverage   45.35%   45.35%           
=======================================
  Files         750      750           
  Lines       85115    85115           
=======================================
+ Hits        38605    38606    +1     
+ Misses      40264    40262    -2     
- Partials     6246     6247    +1     

Impacted Files	Coverage Δ
modules/csv/csv.go	75.92% <0.00%> (ø)
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
modules/log/event.go	60.64% <0.00%> (-1.86%)	⬇️
routers/web/repo/view.go	41.52% <0.00%> (+0.57%)	⬆️
modules/queue/workerpool.go	53.81% <0.00%> (+0.76%)	⬆️
modules/git/blame.go	67.14% <0.00%> (+1.42%)	⬆️
models/unit.go	43.83% <0.00%> (+2.73%)	⬆️

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