Fix HTTP2 max_frame_size error

[twose]

No description provided.

[codecov]

Codecov Report

Merging #4394 (b62e1c1) into master (0e42cbe) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4394      +/-   ##
==========================================
+ Coverage   51.39%   51.42%   +0.03%     
==========================================
  Files          73       73              
  Lines       14691    14691              
==========================================
+ Hits         7550     7555       +5     
+ Misses       7141     7136       -5     

Impacted Files	Coverage Δ
src/server/port.cc	50.00% <0.00%> (-0.28%)	⬇️
src/os/async_thread.cc	70.17% <0.00%> (+1.31%)	⬆️
src/protocol/base.cc	63.15% <0.00%> (+1.97%)	⬆️

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