channel: Return PostAction::Remove on disconnect

[ids1024]

It seems 86c6713 broke this. By maintaining a copy of Ping, the ping source will never return PostAction::Remove.

(I guess we could use more tests to catch things like this...)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.22%. Comparing base (5ba1370) to head (2f398bc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #208      +/-   ##
==========================================
+ Coverage   85.44%   86.22%   +0.77%     
==========================================
  Files          13       15       +2     
  Lines        1876     2069     +193     
==========================================
+ Hits         1603     1784     +181     
- Misses        273      285      +12     

Flag	Coverage Δ
macos-latest	85.50% <100.00%> (?)
ubuntu-latest	85.82% <100.00%> (?)

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[notgull]

Thanks!