fix: fbridge auth checking bug (backport #1361)

[mergify]

Description

closes: #XXXX

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

---

This is an automatic backport of pull request #1361 done by [Mergify](https://mergify.com).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.91%. Comparing base (3301445) to head (7310636).

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v0.49.x    #1362   +/-   ##
================================================
  Coverage            68.90%   68.91%           
================================================
  Files                  675      675           
  Lines                69140    69143    +3     
================================================
+ Hits                 47643    47650    +7     
+ Misses               19220    19217    -3     
+ Partials              2277     2276    -1     

Files	Coverage Δ
x/fbridge/keeper/keeper.go	72.34% <100.00%> (+4.20%)	⬆️

... and 1 file with indirect coverage changes