[MCPE-17831] no empty bowl after eating mushroom stew

When you eat mushroom soup, you have no empty bowl, it disappears completely here. This may be intended but it is a change from the past!

In the internal vanilla server pack's items.json:

    "mushroom_stew": {
      "use_duration": 32,
      "max_stack_size": 1,

      "food": {
        "nutrition": 6,
        "saturation_modifier": "normal",
        "is_meat": false,
        "using_converts_to": "item.bowl"
      }
    },

Notice how it uses "item.bowl". This is INCORRECT. It should say just "bowl", as seen in rabbit stew or beetroot soup:

    "rabbit_stew": {
      "use_duration": 32,
      "max_stack_size": 1,

      "food": {
        "nutrition": 10,
        "saturation_modifier": "normal",
        "using_converts_to": "bowl",
        "is_meat": true
      }
    },