Fix reactivity on v-model (at least) with FormulateForm

[gahabeen]

This fixes a use case of mine as well as reported bug #108.

My use case is to have one object settings that is updated by several FormulateForm's.
Currently, the proxy wouldn't update which means that model would get reset with old values when updating another FormulateForm input.

With this fix the following code works:

<FormulateForm v-model="model" :schema="schema1">
<FormulateForm v-model="model" :schema="schema2">

export default {
  setup() {
    const model = ref({ a: true, b: false, c: false })
    const schema1 = [
      {
        type: 'checkbox',
        name: 'a',
        // ...
      },
      {
        type: 'checkbox',
        name: 'b',
        // ...
      },
    ]
    const schema1 = [
      {
        type: 'checkbox',
        name: 'a',
        // ...
      },
      {
        type: 'checkbox',
        name: 'c',
        // ...
      },
    ]
    return { model, schema1, schema2 }
  },
}

[justin-schroeder]

This is dope @gahabeen 👍. Looks like a solid improvement, and I appreciate the test case to back it up. I merged this into the release/2.4.3. Was hoping to publish that earlier this week, but the bill-paying job has forced me to extend that timeline a bit. Either way, it'll see the light of day.

Kiitos 🙏

[gahabeen]

Nice! Don't worry, I've got my quick fix for now which works fine.

Tusen takk! (Now living in Norway, only been less than a week though 😅)