Use rgbasm's GameBoy graphics literal for initializing wCreditsFaux2bpp

In the 2BPP format, two bytes %ABCDEFGH %abcdefgh define eight pixels %Aa %Bb %Cc %Dd %Ee %Ff %Gg %Hh.
Four valid colors: %00 = 0 = white, %01 = 1 = dark, %10 = 2 = light, %11 = 3 = black.
Thus `22222222 = pixels %10 %10 %10 %10 %10 %10 %10 %10 = bytes %11111111 %00000000 = $ff00.

engine/movie/credits.asm

@@ -21,8 +21,8 @@ Credits::
 	call ClearSprites
 
 	ld hl, wCreditsFaux2bpp
-	ld c, $80
-	ld de, $ff00
+	ld c, wCreditsFaux2bppEnd - wCreditsFaux2bpp
+	ld de, `22222222 ; eight pixels, each with color #2
 
 .load_loop
 	ld a, e

engine/movie/crystal_intro.asm

@@ -795,7 +795,7 @@ IntroScene9:
 	call DelayFrame
 	call DelayFrame
 	call DelayFrame
-	ld a, $c ; $980c
+	ld a, LOW(vBGMap0 + $c) ; $c
 	ldh [hBGMapAddress], a
 	call DelayFrame
 	call DelayFrame

wram.asm

@@ -45,7 +45,7 @@ wCurNoteDuration:: db ; used in MusicE0 and LoadNote
 wCurMusicByte:: db ; c298
 wCurChannel:: db ; c299
 wVolume:: ; c29a
-; corresponds to $ff24
+; corresponds to rNR50
 ; Channel control / ON-OFF / Volume (R/W)
 ;   bit 7 - Vin->SO2 ON/OFF
 ;   bit 6-4 - SO2 output level (volume) (# 0-7)
@@ -53,12 +53,12 @@ wVolume:: ; c29a
 ;   bit 2-0 - SO1 output level (volume) (# 0-7)
 	db
 wSoundOutput:: ; c29b
-; corresponds to $ff25
+; corresponds to rNR51
 ; bit 4-7: ch1-4 so2 on/off
 ; bit 0-3: ch1-4 so1 on/off
 	db
 wSoundInput:: ; c29c
-; corresponds to $ff26
+; corresponds to rNR52
 ; bit 7: global on/off
 ; bit 0: ch1 on/off
 ; bit 1: ch2 on/off
@@ -1069,7 +1069,8 @@ wc9f9:: ds 7
 
 UNION ; ca00
 ; blank credits tile buffer
-wCreditsFaux2bpp:: ds 128
+wCreditsFaux2bpp:: ds 8 * LEN_2BPP_TILE
+wCreditsFaux2bppEnd::
 
 NEXTU ; ca00
 ; mystery gift data