Can now equip fireaxe, claymore, spear and baseball back on your back (#4484)

* Can equip spears and claymores on your back now

* Adds fireaxe and baseball bat back equip

Resources/Textures/Objects/Weapons/Melee/baseball_bat.rsi/meta.json

@@ -1,12 +1,15 @@
 {
   "version": 1,
   "license": "CC-BY-NC-SA-3.0",
-  "copyright": "Taken from goonstation at commit https://github.com/goonstation/goonstation/pull/3555/commits/b24eb6260647c0fcfe858268a26b6160bc50017a",
+  "copyright": "Taken from goonstation and modified by Swept at commit https://github.com/goonstation/goonstation/pull/3555/commits/b24eb6260647c0fcfe858268a26b6160bc50017a",
   "size": {
       "x": 32,
       "y": 32
   },
   "states": [
+    {
+      "name": "icon"
+    },
     {
       "name": "inhand-left",
       "directions": 4
@@ -16,7 +19,8 @@
       "directions": 4
     },
     {
-      "name": "icon"
+      "name": "equipped-BACKPACK",
+      "directions": 4
     }
   ]
 }