Fix roles and permissions check for trusted application

Proposed changes

This PR fixes roles and permissions check for trusted application.

Types of changes

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[X] Bugfix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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[X] I have read the CONTRIBUTING doc
[X] I have signed the CLA
[ ] I have added tests that prove my fix is effective or that my feature works
[ ] I have added necessary documentation (if appropriate)
[ ] Any dependent changes have been merged and published in downstream modules

Further comments

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ging / fiware-idm