Fixes wrong provider name in error message

[LukasLJL]

Description of your changes

This PR fixes displaying the wrong provider name (grafana -> keycloak) in the error message, when an error occurs with the provider/providerConfig.

I have:

• [x] Read and followed Crossplane's contribution process.
• [x] Run make reviewable test to ensure this PR is ready for review.

[Breee]

thx!