Brighter Nether Bricks

Changes nether bricks from a dark maroon to a more burgundy color. Helps with visibility in nether fortresses and adds some nice contrast from red nether bricks.

Only changes the textures for the Nether Bricks block, Cracked Nether Bricks block, Chiseled Nether Bricks block, and Nether Brick item, all of which can be viewed from the Images tab.