Fixing a bug in the powerbi sso assignment

[ewastempel]

A reference to the issue / Description of it

See slack thread here: https://mojdt.slack.com/archives/C013RM6MFFW/p1707225725037789

How does this PR fix the problem?

The returned output is already an arn, this PR is to correct the path to it.

How has this been tested?

Please describe the tests that you ran and provide instructions to reproduce.

This has been run locally for sprinkler.

Deployment Plan / Instructions

Will this deployment impact the platform and / or services on it?

This will be deployed to all environments.

Checklist (check x in [ ] of list items)

• I have performed a self-review of my own code
• All checks have passed
• I have made corresponding changes to the documentation
• Plan and discussed how it should be deployed to PROD (If needed)

[github-actions]

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Setting default tflint config...
Running tflint --init...
Installing "terraform" plugin...
Installed "terraform" (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.5.0)
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