Citrine grass encounter fix

Had to hardcode the tile to work. Yeah.

data/tilesets/tileset_headers.asm

@@ -9,7 +9,6 @@ ENDM
 Tilesets:
 	table_width 12, Tilesets
 	; name, 3 counter tiles, grass tile, animations
-	; FIXME: Needs to have a new column for a second grass tile for Citrine to work properly. Missing tile is $3F.
 	tileset Overworld,    -1, -1, -1, $52, TILEANIM_WATER_FLOWER
 	tileset RedsHouse1,   -1, -1, -1,  -1, TILEANIM_NONE
 	tileset Mart,        $18,$19,$1E,  -1, TILEANIM_NONE

data/tilesets/water_tilesets.asm

@@ -9,4 +9,5 @@ WaterTilesets:
 	db CAVERN
 	db FACILITY
 	db PLATEAU
+	db CITRINE
 	db -1 ; end

engine/battle/wild_encounters.asm

@@ -31,6 +31,13 @@ TryDoWildEncounter:
 	cp c
 	ld a, [wGrassRate]
 	jr z, .CanEncounter
+	
+	cp CITRINE
+	ld a, $0E ; So the Citrine grass works.
+	cp c
+	ld a, [wGrassRate]
+	jr z, .CanEncounter
+	
 	ld a, $14 ; in all tilesets with a water tile, this is its id
 	cp c
 	ld a, [wWaterRate]