Document wSuicuneFrame

Also fixed inmediate in PlaceMapNameFrame.FillTopBottom to calculate the
amount of loops required. (It fills two tiles in the first iteration,
and four in the remaining, hence the `-2` and `+1` part).

engine/events/map_name_sign.asm

@@ -242,7 +242,7 @@ PlaceMapNameFrame:
 	ret
 
 .FillTopBottom:
-	ld c, 5
+	ld c, ((SCREEN_WIDTH - 2) - 2) / 4 + 1
 	jr .enterloop
 
 .continueloop

engine/movie/title.asm

@@ -208,7 +208,7 @@ _TitleScreen:
 	ldh [hBGMapMode], a
 
 	xor a
-	ld [wd002], a
+	ld [wSuicuneFrame], a
 
 ; Play starting sound effect
 	call SFXChannelsOff
@@ -218,7 +218,7 @@ _TitleScreen:
 	ret
 
 SuicuneFrameIterator:
-	ld hl, wd002
+	ld hl, wSuicuneFrame
 	ld a, [hl]
 	ld c, a
 	inc [hl]

wram.asm

@@ -1710,6 +1710,7 @@ NEXTU ; d002
 wTempDayOfWeek::
 wApricorns::
 wKeepSevenBiasChance:: ; used in the slots to handle the favoring of 7 symbol streaks
+wSuicuneFrame::
 	db
 	ds 2
 wStartFlypoint:: db