Better diamond block texture

mods/default/README.txt

@@ -109,7 +109,6 @@ PilzAdam (WTFPL):
   default_gold_lump.png
   default_mineral_gold.png
   default_diamond.png
-  default_diamond_block.png
   default_tool_diamondpick.png
   default_tool_diamondsword.png
   default_tool_diamondshovel.png
@@ -140,6 +139,7 @@ Zeg9 (CC BY-SA 3.0):
   default_copper_block.png
   default_bronze_block.png
   default_gold_block.png
+  default_diamond_block.png
 
 Glass breaking sounds (CC BY 3.0):
   1: http://www.freesound.org/people/cmusounddesign/sounds/71947/