Blender Git Loki

Fix T86463: Colored collection icons don't scale with zoom level

This patch fixes the issue in T86463 that colored collection icons in
the collection search box don't scale according to the zoom level.

The issue was caused by the drawing function for the colored
collection icons not allowing to change the size of the icons.
This patch addresses that by scaling the icon based on the drawing
width.

Reviewed By: #user_interface, natecraddock, Severin

Differential Revision: https://developer.blender.org/D10708