p2p: remove unused argument 'flags'

[ucwong]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.21%. Comparing base (13821ff) to head (50eef15).
Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1926   +/-   ##
=======================================
  Coverage   47.20%   47.21%           
=======================================
  Files         568      568           
  Lines       68814    68814           
=======================================
+ Hits        32486    32492    +6     
+ Misses      33802    33799    -3     
+ Partials     2526     2523    -3     

Files	Coverage Δ
p2p/server.go	72.57% <100.00%> (ø)

... and 14 files with indirect coverage changes