Find All References window should respect dark mode

[vchelaru]

1. Create a project which has an entity (such as Player) and an instance of that entity somewhere (such as Player in GameScreen) - you can use the default platformer or top downs for this
2. Switch to dark mode
3. Right-click on the Player entity
4. Select Find all references to this

Observe - popup window has a list box which is not styled for dark mode. List items are hard to read.
Expected - popup window should be styled for dark mode