feat: add steam_disk_space egg feature to SteamCMD eggs

A new egg feature modal was introduced in Panel v1.7.0 triggering when server has run out of disk space to provide more user-friendly instructions to both admins and normal users. This is unique to SteamCMD specific errors.

game_eggs/steamcmd_servers/space_engineers/egg-space-engineers.json

@@ -8,7 +8,9 @@
     "name": "Space Engineers",
     "author": "tueye@tuworld.de",
     "description": "Space Engineers is a voxel-based sandbox game set in space and on planets.",
-    "features": null,
+    "features": [
+        "steam_disk_space"
+    ],
     "images": [
         "quay.io\/parkervcp\/pterodactyl-images:debian_wine-5"
     ],
@@ -164,4 +166,4 @@
             "rules": "required|string|in:1"
         }
     ]
-}
+}