mqtt: rm / in topic

[fengzeroz]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.92%. Comparing base (7059252) to head (9eaf8f0).
⚠️ Report is 182 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2486      +/-   ##
==========================================
- Coverage   66.93%   66.92%   -0.01%     
==========================================
  Files         121      121              
  Lines       27444    27444              
==========================================
- Hits        18369    18367       -2     
- Misses       9075     9077       +2     

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