Tidy: fix typo in test class name

[dbeatty10]

Problem

The test class name here has Snowflake instead of Redshift.

Solution

Update the name of the test class. This has no functional change, just a readability one.

Checklist

• I have read the contributing guide and understand what's expected of me
• Tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the dbt-redshift contributing guide.

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the dbt-redshift contributing guide.