remove corruptionTesseract color from theme

[Fillyosopher]

When changing theme, the tesseract display in corruption changes from white to purple. This is likely a diverged default. I considered fixing it by setting it to the existing default of white.

However, no other cube-type lines change color with theme change. It seems more consistent to leave the color the same.

This removes the color change for Tesseract when theme is modified.

Dark

Before:

After:

Light

before:

after:

[Pseudonian]

We probably should just remove the line (not comment it out) from each theme, because I do not plan on changing the color lines in accordance to theme.

Thanks for fixing this oversight!

[Fillyosopher]

No problem, lines removed.

I'm still poking at the idea of a rehauling more of the color css and themes into conditional css variables, but I've been waiting until I reach Ascension and have more tabs unlocked. One Day~