Fix the color on the empty row for datagrids.

Review Request #14201 — Created Oct. 15, 2024 and submitted — Latest diff uploaded

Information

Djblets
release-5.x

Reviewers

While standing up a new environment, I noticed that the empty-row for
datagrids was still using a hardcoded light color. This change fixes
that.

This also cleans up a few places where we were defining scoped variables
that were no longer used.

Looked at a server with an empty dashboard and no longer saw a white row
in the datagrid.

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