Fix remaining non-returning Destroys()

Plus a little refactor to mining flaps and spacepod doors- they now use
CanAtmosPass instead of manually setting the turf to no-atmos-passing

code/modules/reagents/Chemistry-Holder.dm

@@ -637,7 +637,7 @@ atom/proc/create_reagents(var/max_vol)
 
 /datum/reagents/Destroy()
 	for(var/datum/reagent/reagent in reagent_list)
-		reagent.Destroy()
+		qdel(reagent)
 
 	if(my_atom)
 		my_atom = null

code/modules/reagents/Chemistry-Reagents.dm

@@ -166,7 +166,7 @@ datum
 				if(src.data["virus"])
 					var/datum/disease/D = src.data["virus"]
 					D.cure(0)
-				..()
+				return ..()
 */
 
 /*

code/modules/reagents/reagent_containers/food/condiment.dm

@@ -190,16 +190,16 @@
 	if(istype(target, /obj/item/weapon/reagent_containers/food/snacks))
 		if(!reagents.total_volume)
 			user << "<span class='warning'>You tear open [src], but there's nothing in it.</span>"
-			Destroy()
+			qdel(src)
 			return
 		if(target.reagents.total_volume >= target.reagents.maximum_volume)
 			user << "<span class='warning'>You tear open [src], but [target] is stacked so high that it just drips off!</span>" //Not sure if food can ever be full, but better safe than sorry.
-			Destroy()
+			qdel(src)
 			return
 		else
 			user << "<span class='notice'>You tear open [src] above [target] and the condiments drip onto it.</span>"
 			src.reagents.trans_to(target, amount_per_transfer_from_this)
-			Destroy()
+			qdel(src)
 
 /obj/item/weapon/reagent_containers/food/condiment/pack/on_reagent_change()
 	if(reagents.reagent_list.len > 0)