Cleans up backpack prototypes/rsis (#2002)

* Backpack rsis up to snuff

* Readds holding meta.json

* Updated bag of holdings license

* Backpacks prototype now clean

Resources/Textures/Clothing/Back/Backpacks/captain.rsi/meta.json

@@ -1,24 +1,26 @@
 {
     "version": 1,
+    "license": "CC-BY-SA-3.0",
+    "copyright": "Taken from tgstation at commit https://github.com/tgstation/tgstation/commit/547852588166c8e091b441e4e67169e156bb09c1",
     "size": {
         "x": 32,
         "y": 32
     },
     "states": [
         {
-            "name": "captain-inhand-right",
-            "directions": 4
-        },
-        {
-            "name": "captain",
+            "name": "icon",
             "directions": 1
         },
         {
-            "name": "captain-equipped-BACKPACK",
+            "name": "equipped-BACKPACK",
             "directions": 4
         },
         {
-            "name": "captain-inhand-left",
+            "name": "inhand-left",
+            "directions": 4
+        },
+        {
+            "name": "inhand-right",
             "directions": 4
         }
     ]