Move 'map attributes' into 'layouts'

data/layouts/SealedChamber_OuterRoom/layout.inc

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+	.align 2
+SealedChamber_OuterRoom_MapBorder::
+	.incbin "data/layouts/SealedChamber_OuterRoom/border.bin"
+
+	.align 2
+SealedChamber_OuterRoom_MapBlockdata::
+	.incbin "data/layouts/SealedChamber_OuterRoom/map.bin"
+
+	.align 2
+SealedChamber_OuterRoom_Layout::
+	.4byte 0x15
+	.4byte 0x17
+	.4byte SealedChamber_OuterRoom_MapBorder
+	.4byte SealedChamber_OuterRoom_MapBlockdata
+	.4byte gTileset_General
+	.4byte gTileset_Cave

data/layouts/SealedChamber_OuterRoom/map.bin

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