Move NUM_BUENA_PRIZES to event/buena.asm (still hard-coded)

Buena_PrizeMenu has "rept NUM_BUENA_PRIZES", which needs NUM_BUENA_PRIZES to be already defined. BuenaPrizeItems and BuenaPrizeItemsEnd are needed to define NUM_BUENA_PRIZES; but BuenaPrizeItems is defined after Buena_PrizeMenu. I don't see a way to avoid hard-coding its value of 9.

Contrast that with the NUM_MOM_ITEMS constants, which are not used as "rept" arguments and so can be defined within their code file.

event/buena.asm

@@ -288,6 +288,8 @@ Buena_PrizeMenu: ; 8b0e2
 	dba .prizepoints
 ; 8b129
 
+NUM_BUENA_PRIZES EQU 9 ; ((BuenaPrizeItemsEnd - BuenaPrizeItems) / 2)
+
 .indices ; 8b129
 	db NUM_BUENA_PRIZES
 x = 1

event/mom_phone.asm

@@ -1,3 +1,6 @@
+NUM_MOM_ITEMS_1 EQUS "((MomItems_1End - MomItems_1) / 8)"
+NUM_MOM_ITEMS_2 EQUS "((MomItems_2End - MomItems_2) / 8)"
+
 const_value = 1
 	const MOM_ITEM
 	const MOM_DOLL
@@ -57,7 +60,7 @@ MomTriesToBuySomething:: ; fcfec
 
 CheckBalance_MomItem2: ; fd044
 	ld a, [wWhichMomItem]
-	cp 10
+	cp NUM_MOM_ITEMS_2
 	jr nc, .nope
 	call GetItemFromMom
 	ld a, [hli]
@@ -100,7 +103,7 @@ CheckBalance_MomItem2: ; fd044
 
 .exact
 	call .AddMoney
-	ld a, 5
+	ld a, NUM_MOM_ITEMS_1
 	call RandomRange
 	inc a
 	ld [wWhichMomItemSet], a
@@ -195,7 +198,7 @@ GetItemFromMom: ; fd117
 
 .zero
 	ld a, [wWhichMomItem]
-	cp 10 ; length of MomItems_2
+	cp NUM_MOM_ITEMS_2
 	jr c, .ok
 	xor a