fix(ext.bridge): fix bridge_commands attribute

[Middledot]

Summary

Fix #1800
Tested with the code given there

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.

[codecov]

Codecov Report

Merging #1802 (860d0b1) into master (b20f134) will decrease coverage by 0.00%.
The diff coverage is 28.57%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1802      +/-   ##
==========================================
- Coverage   33.21%   33.21%   -0.01%     
==========================================
  Files          96       96              
  Lines       18653    18657       +4     
==========================================
  Hits         6196     6196              
- Misses      12457    12461       +4     

Flag	Coverage Δ
macos-latest-3.10	33.19% <28.57%> (-0.01%)	⬇️
macos-latest-3.11	33.19% <28.57%> (-0.01%)	⬇️
macos-latest-3.8	33.20% <28.57%> (-0.01%)	⬇️
macos-latest-3.9	33.20% <28.57%> (-0.01%)	⬇️
ubuntu-latest-3.10	33.19% <28.57%> (-0.01%)	⬇️
ubuntu-latest-3.11	33.19% <28.57%> (-0.01%)	⬇️
ubuntu-latest-3.8	33.20% <28.57%> (-0.01%)	⬇️
ubuntu-latest-3.9	33.20% <28.57%> (-0.01%)	⬇️
windows-latest-3.10	33.19% <28.57%> (-0.01%)	⬇️
windows-latest-3.11	33.19% <28.57%> (-0.01%)	⬇️
windows-latest-3.8	33.20% <28.57%> (-0.01%)	⬇️
windows-latest-3.9	33.20% <28.57%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
discord/cog.py	34.92% <28.57%> (-0.38%)	⬇️

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