Fix sockopt.TcpKeepAliveInterval

[cubarco]

The Keep-Alive configs may be overridden with golang default settings when tcpKeepAliveInterval is set without tcpKeepAliveIdle.
Adopt: XTLS/Xray-core#1328

[codecov-commenter]

Codecov Report

Base: 38.91% // Head: 38.90% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (10d3113) compared to base (9bbc3af).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2149      +/-   ##
==========================================
- Coverage   38.91%   38.90%   -0.02%     
==========================================
  Files         615      615              
  Lines       36440    36440              
==========================================
- Hits        14182    14178       -4     
- Misses      20678    20683       +5     
+ Partials     1580     1579       -1     

Impacted Files	Coverage Δ
transport/internet/system_dialer.go	46.98% <0.00%> (ø)
transport/internet/system_listener.go	48.07% <0.00%> (ø)
transport/internet/udp/hub.go	73.61% <0.00%> (-4.17%)	⬇️
transport/internet/quic/hub.go	72.00% <0.00%> (-2.67%)	⬇️
proxy/vmess/outbound/outbound.go	59.05% <0.00%> (-0.79%)	⬇️
transport/internet/kcp/connection.go	72.37% <0.00%> (+0.55%)	⬆️

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