Lighten each logo path color instead of white

## What does this MR do?
Changes highlight/loading colors of tanuki from white to a lighter version of each path color

## Why was this MR needed?
Since the logo is no longer on the dark sidebar, the highlight color was getting lost against the light gray background

## What are the relevant issue numbers?
Closes #18521 

## Screenshots (if relevant)
![logo](/uploads/3743925862fa8e17d2fec426f7e4c853/logo.gif)

cc @jschatz1 @lbennett @dzaporozhets 

See merge request !4690