Bools and returns super-pr (#53221)

Replaces like 70-80% of 0 and such, as a side effect cleaned up a bunch of returns
Edit: Most left out ones are in mecha which should be done in mecha refactor already
Oh my look how clean it is

Co-authored-by: TiviPlus <TiviPlus>
Co-authored-by: Couls <coul422@gmail.com>

code/modules/hydroponics/grown.dm

@@ -54,8 +54,8 @@
 	if(reagents)
 		if(bitesize_mod)
 			bitesize = 1 + round(reagents.total_volume / bitesize_mod)
-		return 1
-	return 0
+		return TRUE
+	return FALSE
 
 /obj/item/reagent_containers/food/snacks/grown/examine(user)
 	. = ..()

code/modules/hydroponics/growninedible.dm

@@ -44,8 +44,8 @@
 
 /obj/item/grown/proc/add_juice()
 	if(reagents)
-		return 1
-	return 0
+		return TRUE
+	return FALSE
 
 /obj/item/grown/throw_impact(atom/hit_atom, datum/thrownthing/throwingdatum)
 	if(!..()) //was it caught by a mob?