Fix #262 that application certificates are not created when enabling openid using API

This PR fixes issue #262 that application certificates are not created when enabling openid using API.

Proposed 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)

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ging / fiware-idm