move battle vars to c file

asm/party_menu.s

@@ -16302,7 +16302,7 @@ _081B8BA8:
 	movs r0, 0x1
 	strb r0, [r1]
 	ldr r1, =gBattlerPartyIndexes
-	ldr r0, =gBankInMenu
+	ldr r0, =gBattlerInMenuId
 	ldrb r0, [r0]
 	lsls r0, 1
 	adds r0, r1
@@ -16334,7 +16334,7 @@ _081B8BFC:
 	b _081B8C42
 	.pool
 _081B8C20:
-	ldr r0, =gBankInMenu
+	ldr r0, =gBattlerInMenuId
 	ldrb r0, [r0]
 	ldr r1, =gBattlerPartyIndexes
 	lsls r0, 1

asm/pokemon_item_effect.s

@@ -77,7 +77,7 @@ ExecuteTableBasedItemEffect: @ 806BD28
 	cmp r0, 0
 	beq _0806BDA8
 	ldr r2, =gEnigmaBerries
-	ldr r0, =gBankInMenu
+	ldr r0, =gBattlerInMenuId
 	ldrb r1, [r0]
 	lsls r0, r1, 3
 	subs r0, r1
@@ -101,7 +101,7 @@ _0806BDBC:
 _0806BDC4:
 	str r0, [sp, 0x34]
 	ldr r1, =gStringBattler
-	ldr r0, =gBankInMenu
+	ldr r0, =gBattlerInMenuId
 	ldrb r2, [r0]
 	strb r2, [r1]
 	ldr r0, =gMain