Move fire dragon portrait to core

data/campaigns/Sceptre_of_Fire/scenarios/8_The_Dragon.cfg

@@ -69,7 +69,6 @@
         type=Fire Dragon
         id=Khrakrahs
         name= _ "Khrakrahs"
-        profile=portraits/khrakrahs.png
         side=3
         canrecruit=yes
         controller=ai

data/campaigns/The_Rise_Of_Wesnoth/scenarios/17a_The_Dragon.cfg

@@ -364,9 +364,6 @@
             [/variable]
             [then]
                 {NAMED_LOYAL_UNIT 6 (Fire Dragon) 20 27 ("Shek'kahan") ( _ "Shek’kahan")}
-                [+unit]
-                    profile=portraits/shekkahan.png
-                [/unit]
 
                 [set_variable]
                     name=dragon_awake
@@ -399,9 +396,6 @@
             [/variable]
             [then]
                 {NAMED_LOYAL_UNIT 6 (Fire Dragon) 20 27 ("Shek'kahan") ( _ "Shek’kahan")}
-                [+unit]
-                    profile=portraits/shekkahan.png
-                [/unit]
 
                 [set_variable]
                     name=dragon_awake

data/core/units/monsters/Fire_Dragon.cfg

@@ -3,6 +3,7 @@
     id=Fire Dragon
     name= _ "Fire Dragon"
     race=monster
+    profile="portraits/monsters/fire-dragon.png"
     # workaround to cut the transparent part when displayed in the help
     image="units/monsters/fire-dragon.png~CROP(3,0,154,154)"
     [standing_anim]