Fix fullWidth support on AutoCompleteInput

[fzaninotto]

Closes #4093 for AutocompleteInput and AutocompleteArrayInput

Now, these two inputs work like all the other components and accept a fullWidth property.

To enable fullWith on AutocompleteInput:

• When used standalone, add the fullWidth attribute to the AutocompleteInput:

<AutocompleteInput
    source="foo"
    choices={[
        { id: 1, name: 'foo' },
        { id: 2, name: 'bar' },
    ]}
    fullWidth
/>

• When used inside a ReferenceInput, set the fullWidth prop on the ReferenceInput:

<ReferenceInput source="post_id" reference="posts" fullWidth>
    <AutocompleteInput optionText="title" />
</ReferenceInput>