Experience orb's colors are too light

Summary:
The experience orb's colors appear too light since 1.13.

Steps to Reproduce:

1. Throw a few experience bottles on the ground.
2. Compare the colors of the experience orb to the colors from 1.12.

Observed Results:
The experience orb's colors look lighter than they did in 1.12.

Expected Results:
The experience orb's colors look the same as they did in 1.12.