Fix: Trojan fallback cannot get ALPN

[AkinoKaede]

fix #1282

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.68%. Comparing base (a0a97c0) to head (84fc5b9).
Report is 867 commits behind head on master.

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Additional details and impacted files

@@            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     

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[kslr]