No issue attached, as this is something trivial and should have been
part of my merged PR
[here](https://github.com/zed-industries/zed/pull/22073).
For context, in the above-mentioned PR, I removed the hover color from
selected/marked entries in the Project Panel. The reasoning behind this
change is already explained in that PR, but to reiterate:
> This change was inspired by the behavior in VSCode, the Firefox
sidebar, and Dolphin (KDE File Manager). When an item is selected, it
doesn’t display a separate hover state to avoid confusing users about
whether the item is selected or merely hovered over.
@nilskch mentioned in the comments of the above PR that I should have
also changed the background of the knockout icon, which appears on
entries, to match the entry background color on hover. This PR addresses
that.
Before:

After:

Release Notes:
- N/A