Move 'map attributes' into 'layouts'

data/maps/SealedChamber_OuterRoom/header.inc

@@ -1,5 +1,5 @@
 SealedChamber_OuterRoom: @ 8484684
-	.4byte SealedChamber_OuterRoom_MapAttributes
+	.4byte SealedChamber_OuterRoom_Layout
 	.4byte SealedChamber_OuterRoom_MapEvents
 	.4byte SealedChamber_OuterRoom_MapScripts
 	.4byte 0x0

data/maps/SealedChamber_OuterRoom/map.bin

@@ -1,11 +0,0 @@
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