fix a unitTest failure on windows

[wuxiangzhou2010]

reproduced on go1.10 windows/amd64 , v2ray version : 3c2b75f

platform_test.go:55: Not true that (\v2ray\t) equals to (/v2ray/t)
--- FAIL: TestGetAssetLocation (0.00s)

[codecov]

Codecov Report

Merging #1053 into master will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1053      +/-   ##
==========================================
+ Coverage   75.17%   75.24%   +0.06%     
==========================================
  Files         226      226              
  Lines       10005    10005              
==========================================
+ Hits         7521     7528       +7     
+ Misses       1770     1764       -6     
+ Partials      714      713       -1

Impacted Files	Coverage Δ
common/log/logger.go	84.37% <0%> (-3.13%)	⬇️
proxy/vmess/inbound/inbound.go	76.96% <0%> (-1.58%)	⬇️
transport/ray/direct.go	85.29% <0%> (-1.48%)	⬇️
proxy/shadowsocks/client.go	70.21% <0%> (+1.06%)	⬆️
transport/internet/headers/http/http.go	81.56% <0%> (+2.12%)	⬆️
common/buf/copy.go	76.47% <0%> (+7.84%)	⬆️
app/proxyman/mux/session.go	79.45% <0%> (+8.21%)	⬆️

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