sql: remove typo in pg_catalog.pg_aggregate table population.

[abhishek20123g]

This PR corrects the typo introduced by following PR
#48126 that is update reference of builtin function
from cume_dict to cume_dist.

Release note: None

[blathers-crl]

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I have added a few people who may be able to assist in reviewing:

• @yuzefovich (commented on sql: populate pg_catalog.pg_aggregate table #48126)

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[cockroach-teamcity]

This change is 

[yuzefovich]

Thanks for the fix!

nit: could you please update the release note in the commit message and in the PR description so that it is like

Release note: None

For some context, we're using these release notes in the commit messages to auto-generate notes that will go out with a new release (after a tech writer reviews them), and if we have "Release note: None", such note is definitely ignored, but I'm not sure if that's the case if we have "Release note (sql change): None".

Reviewed 1 of 1 files at r1.
Reviewable status: complete! 0 of 0 LGTMs obtained

[blathers-crl]

Thank you for updating your pull request.

My owl senses detect your PR is good for review. Please keep an eye out for any test failures in CI.

_{🦉 Hoot! I am a Blathers, a bot for CockroachDB. My owner is otan.}

[abhishek20123g]

Sure,
Updated 😊

[yuzefovich]

Thanks!

bors r=yuzefovich

[craig]

Build succeeded

• GitHub CI (Cockroach)