fix: quickstart standalone service definition

[spacemeld]

This change updates the service definition for the kratos-selfservice-ui-node container found in ./quickstart-standalone.yml. The docker-compose command will fail due to the invalid yaml configuration.

I was following the steps in the Quickstart section for Ory Kratos using macOS. The set of docker containers will not run as instructed without this fix.

This bug was introduced with this change.

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security. vulnerability, I
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  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[CLAassistant]

All committers have signed the CLA.

[aeneasr]

Thank you!

[vinckr]

Hello @spacemeld
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