Metal rods take up less space (From 3 to 2) (#6032)

# About the pull request

This PR changes metal rods and plasteel rods from occupying 3 spaces to
2.

I haven't done a PR in a bit so this is a warm up. I have a little list
of things tiny little things I wanted to do, its like the sandbag change
morrow did forever ago


Thx Vicarov for some code cleanup

# Explain why it's good for the game

Metal rods and plasteel rods come from metal and plasteel sheets
respectively. These rods are a fraction of the size of said sheet, yet
they occupy the same space. Although people usually don't carry rods, it
didn't seem intuitive to me for them to take up so much space - its like
smaller versions of tent poles, you can usually fit them in your
backpack and they occupy less space than a sock.

There is no incentive to carry rods instead of sheets, because they take
up the same space - despite multiple rods coming from one sheet. It just
doesn't feel intuitive

# Testing Photographs and Procedure

https://cdn.discordapp.com/attachments/1042176396711170119/1221640724911620166/image.png?ex=66135095&is=6600db95&hm=f8fd020781cbc8d68e5acf552ecf485a6cf34a20291289eef06d823b8c103fce&

# Changelog
:cl:
balance: Metal rods take up less space in an inventory (3 slots to 2)
code: removes some redundant code on plasteel rods
/:cl:

code/game/objects/items/stacks/rods.dm

@@ -4,7 +4,7 @@
 	singular_name = "metal rod"
 	icon_state = "rods"
 	flags_atom = FPRINT|CONDUCT
-	w_class = SIZE_MEDIUM
+	w_class = SIZE_SMALL
 	force = 9
 	throwforce = 15
 	throw_speed = SPEED_VERY_FAST
@@ -54,13 +54,7 @@ GLOBAL_LIST_INIT(rod_recipes, list (
 	singular_name = "plasteel rod"
 	icon_state = "rods_plasteel"
 	flags_atom = FPRINT
-	w_class = SIZE_MEDIUM
-	force = 9
-	throwforce = 15
-	throw_speed = SPEED_VERY_FAST
-	throw_range = 20
 	matter = list("plasteel" = 3750)
-	max_amount = 60
 	attack_verb = list("hit", "bludgeoned", "whacked")
 	stack_id = "plasteel rod"
 	sheet_path = /obj/item/stack/sheet/plasteel