Refactors reagent exposure code (#51396)

* Refactors reagent exposure code

Removes istype clutter. Renames a few procs

* == TRUE

Adjusts COMPONENT_NO_EXPOSE_REAGENTS bitflag offset.

TODO: Remove comment

Co-authored-by: Rohesie <rohesie@gmail.com>

* == TRUE

Adjusts COMONENT_NO_EXPOSE REAGENTS bitflag offset.

Removes comment

Co-authored-by: Rohesie <rohesie@gmail.com>

code/game/objects/structures/janicart.dm

@@ -88,7 +88,7 @@
 		user.visible_message("<span class='notice'>[user] begins to empty the contents of [src].</span>", "<span class='notice'>You begin to empty the contents of [src]...</span>")
 		if(I.use_tool(src, user, 30))
 			to_chat(usr, "<span class='notice'>You empty the contents of [src]'s bucket onto the floor.</span>")
-			reagents.reaction(src.loc)
+			reagents.expose(src.loc)
 			src.reagents.clear_reagents()
 	else
 		return ..()

code/game/objects/structures/shower.dm

@@ -99,7 +99,7 @@
 
 /obj/machinery/shower/proc/wash_atom(atom/A)
 	A.washed(src)
-	reagents.reaction(A, TOUCH, reaction_volume)
+	reagents.expose(A, TOUCH, reaction_volume)
 
 	if(isliving(A))
 		check_heat(A)

code/game/objects/structures/watercloset.dm

@@ -359,7 +359,7 @@
 		O.acid_level = 0
 		create_reagents(5)
 		reagents.add_reagent(dispensedreagent, 5)
-		reagents.reaction(O, TOUCH)
+		reagents.expose(O, TOUCH)
 		user.visible_message("<span class='notice'>[user] washes [O] using [src].</span>", \
 							"<span class='notice'>You wash [O] using [src].</span>")
 		return 1