Prevent znc from prepending "#" in "/join 0".

[RealKindOne]

Fixes #1794

[codecov]

Codecov Report

Merging #1885 (8ac31ac) into master (edd5dac) will increase coverage by 0.04%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1885      +/-   ##
==========================================
+ Coverage   43.74%   43.79%   +0.04%     
==========================================
  Files         122      122              
  Lines       32413    32416       +3     
  Branches       33       33              
==========================================
+ Hits        14179    14196      +17     
+ Misses      18209    18195      -14     
  Partials       25       25              

Files	Coverage Δ
src/Client.cpp	79.02% <100.00%> (+0.05%)	⬆️

... and 5 files with indirect coverage changes

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