Fix requestRender condition in DataSourceDisplay.update

[Beilinson]

Description

Fixes the requestRenderMode issue which stems from #12429.

Issue number and link

Fixes #12543

Testing plan

Sandbox Example

The setTimeouts are so that the scene is definitely NOT requesting any render when updating the polyline material (all the tiles should already be loaded in).

With the above test the bug is easily reproducible, and is fixed with my branch.

Author checklist

• [x] I have submitted a Contributor License Agreement
• [x] I have added my name to CONTRIBUTORS.md
• [x] I have updated CHANGES.md with a short summary of my change
• [ ] I have added or updated unit tests to ensure consistent code coverage
• [x] I have updated the inline documentation, and included code examples where relevant
• [x] I have performed a self-review of my code