fix: remove two unused vardecls (#26756)

code/game/objects/items/weapons/shards.dm

@@ -66,7 +66,7 @@
 	. = TRUE
 	if(!I.use_tool(src, user, volume = I.tool_volume))
 		return
-	var/obj/item/stack/sheet/new_glass = new welded_type(user.loc)
+	new welded_type(user.loc)
 	to_chat(user, "<span class='notice'>You add the newly-formed glass to the stack.</span>")
 	qdel(src)
 

code/modules/hydroponics/grown/towercap.dm

@@ -61,7 +61,7 @@
 		var/seed_modifier = 0
 		if(seed)
 			seed_modifier = round(seed.potency / 25)
-		var/obj/item/stack/plank = new plank_type(user.loc, 1 + seed_modifier)
+		new plank_type(user.loc, 1 + seed_modifier)
 		to_chat(user, "<span class='notice'>You add the newly-formed [plank_name] to the stack.</span>")
 		qdel(src)