fix: remove duplicate role lookup branch

[vjymisal0]

Summary

• Remove a redundant if/else branch in role lookup where both branches returned the same value.
• Let unmatched inputs fall through to the existing return path without changing behavior.

Fixes #6031

Validation

• git diff --check
• go test ./pkg/auth/user/repository (interrupted after several minutes with no output in this environment)

[bito-code-review]

Bito Review Skipped - Source Branch Not Found

Bito didn't review this change because the pull request is no longer valid. It may have been merged, or the source/target branch may no longer exist.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud