Remove credits for deprecated portraits from ARTISTS.

data/core/images/portraits/ARTISTS

@@ -73,11 +73,6 @@ Outdated versions:
 
 Jason Lutes:
 Humans:
-    Peasant
-    Spearman
-    Swordsman
-    Royal Guard
-    Pikeman
     Halberdier
     Javelineer
     Horseman
@@ -93,7 +88,6 @@ James Woo:
     Human Assassin
     Orc Warlords 1 to 5
     Troll
-    Dwarf Guard
 
 Alex Jarocha-Ernst:
 Drakes:
@@ -102,13 +96,11 @@ Drakes:
     Fighter
     Glider
 Mermen:
-    Initiate
     Fighter
     Hunter
 Others:
     Naga and Nagini Fighter
     Orc Assassin
-    Saurian Augur and Skirmisher
 
 Nicholas Kerpan:
     Human Poacher and Thief
@@ -116,14 +108,9 @@ Nicholas Kerpan:
 Pekka Aikio:
     Human Bowman and Longbowman
 
-Tristan Millner:
-    Dwarf Fighter
-
 Unknown:
     Scorpion
-    Old Silver Mage
     Brown Lich
     Cavalryman
-    Elvish Noble Lady
     Human Master Bowman
     Sea Serpent