Move 'map attributes' into 'layouts'

data/maps/RustboroCity_Gym/header.inc

@@ -1,5 +1,5 @@
 RustboroCity_Gym: @ 8483398
-	.4byte RustboroCity_Gym_MapAttributes
+	.4byte RustboroCity_Gym_Layout
 	.4byte RustboroCity_Gym_MapEvents
 	.4byte RustboroCity_Gym_MapScripts
 	.4byte 0x0

data/maps/RustboroCity_Gym/map.bin

@@ -1,2 +0,0 @@
-
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