fix: 'topic/subtopic' matches 'topic/subtopic/#'

[steersbob]

Resolves #239

[codecov]

Codecov Report

Merging #241 (e8c0dd3) into main (3ad32f7) will not change coverage.
The diff coverage is 100.0%.

@@          Coverage Diff          @@
##            main    #241   +/-   ##
=====================================
  Coverage   84.1%   84.1%           
=====================================
  Files          4       4           
  Lines        468     468           
  Branches      87      87           
=====================================
  Hits         394     394           
  Misses        47      47           
  Partials      27      27           

Files Changed	Coverage Δ
aiomqtt/client.py	82.7% <100.0%> (ø)

[empicano]

LGTM, nice that you updated the tests as well 👍

Thanks for another great contribution to aiomqtt!