[MC-147243] Incorrect loot table for Armor Stands

the current look table for Armor Stand entities looks like this;

{
 "type": "minecraft:entity"
}

When it should likely look like this:

{
 "type": "minecraft:entity",
  "pools": [
   {
   "rolls": 1.0,
   "entries": [
    {
     "type": "minecraft:item",
     "name": "minecraft:armor_stand"
    }
   ],
   "conditions": [
    {
    "condition": "minecraft:damage_source_properties",
    "properties": {
     "type": {
      "bypasses_invulnerability": false
     }
    }
   }
  ]
 }
 ]
}

Currently armor stand entities dropping armor stand items is built-in, even though it likely shouldn't be.