Remove unnecessary DMG and SGB checking (#7)

engine/battle/anim_hp_bar.asm

@@ -273,9 +273,6 @@ HPBarAnim_UpdateHPRemaining:
 	ret
 
 HPBarAnim_PaletteUpdate:
-	ldh a, [hCGB]
-	and a
-	ret z
 	ld hl, wCurHPAnimPal
 	call SetHPPal
 	ld a, [wCurHPAnimPal]
@@ -284,14 +281,6 @@ HPBarAnim_PaletteUpdate:
 	ret
 
 HPBarAnim_BGMapUpdate:
-	ldh a, [hCGB]
-	and a
-	jr nz, .cgb
-	call DelayFrame
-	call DelayFrame
-	ret
-
-.cgb
 	ld a, [wWhichHPBar]
 	and a
 	jr z, .load_0

engine/battle/battle_transition.asm

@@ -69,7 +69,7 @@ DoBattleTransition:
 	call UpdateSprites
 	call DelayFrame
 	call .LoadPokeballTiles
-	call BattleStart_CopyTilemapAtOnce
+	call CopyTilemapAtOnce
 	ld a, SCREEN_HEIGHT_PX
 	ldh [hWY], a
 	call DelayFrame
@@ -636,16 +636,6 @@ StartTrainerBattle_LoadPokeBallGraphics:
 	dec b
 	jr nz, .tile_loop
 
-	ldh a, [hCGB]
-	and a
-	jr nz, .cgb
-	ld a, 1
-	ldh [hBGMapMode], a
-	call DelayFrame
-	call DelayFrame
-	jr .nextscene
-
-.cgb
 	ld hl, .pals
 	ld a, [wTimeOfDayPal]
 	maskbits NUM_DAYTIMES
@@ -671,7 +661,7 @@ StartTrainerBattle_LoadPokeBallGraphics:
 	ld a, TRUE
 	ldh [hCGBPalUpdate], a
 	call DelayFrame
-	call BattleStart_CopyTilemapAtOnce
+	call CopyTilemapAtOnce
 
 .nextscene
 	call StartTrainerBattle_NextScene

engine/battle/battlestart_copytilemapatonce.asm

@@ -1,3 +0,0 @@
-BattleStart_CopyTilemapAtOnce:
-	call CGBOnly_CopyTilemapAtOnce
-	ret