Move 'map attributes' into 'layouts'

data/maps/MossdeepCity_StevensHouse/header.inc

@@ -1,5 +1,5 @@
 MossdeepCity_StevensHouse: @ 8483980
-	.4byte MossdeepCity_StevensHouse_MapAttributes
+	.4byte MossdeepCity_StevensHouse_Layout
 	.4byte MossdeepCity_StevensHouse_MapEvents
 	.4byte MossdeepCity_StevensHouse_MapScripts
 	.4byte 0x0

data/maps/MossdeepCity_StevensHouse/map.bin

@@ -1 +0,0 @@
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