Fix: Trojan fallback cannot get ALPN

[AkinoKaede]

fix #1282

[codecov-commenter]

Codecov Report

Merging #1286 (84fc5b9) into master (a0a97c0) will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1286      +/-   ##
==========================================
+ Coverage   44.56%   44.68%   +0.11%     
==========================================
  Files         485      485              
  Lines       29528    29528              
==========================================
+ Hits        13160    13194      +34     
+ Misses      14958    14933      -25     
+ Partials     1410     1401       -9     

Impacted Files	Coverage Δ
proxy/trojan/server.go	0.38% <ø> (ø)
transport/internet/kcp/connection.go	72.37% <0.00%> (+0.55%)	⬆️
transport/pipe/impl.go	89.89% <0.00%> (+2.02%)	⬆️
transport/internet/websocket/connection.go	20.18% <0.00%> (+3.66%)	⬆️
proxy/freedom/freedom.go	49.00% <0.00%> (+4.00%)	⬆️
app/router/command/command.go	57.77% <0.00%> (+4.44%)	⬆️
common/buf/reader.go	88.23% <0.00%> (+5.88%)	⬆️
transport/internet/udp/dispatcher.go	77.14% <0.00%> (+12.38%)	⬆️
app/router/command/errors.generated.go	100.00% <0.00%> (+100.00%)	⬆️

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[kslr]