Fix bug where notes were being rendered with wrong color preferences due to caching

### What does this MR do?

This MR adds the user's color preferences as part of the caching key for notes.

### Why was this MR needed?

This should fix a bug introduced via 4d80360b where notes were being loaded from the cache without regard to the current user's color scheme.

### What are the relevant issue numbers?

Closes #2008

See merge request !994