fix: always hide React Material multi enum when not visible

The 'Hidden' of the MaterialEnumArrayRenderer only applied from screen
size 'xl' and larger. However it should always apply. This fix changes
'xlUp' to 'xsUp', therefore the control is hidden on all screen sizes.

packages/material-renderers/src/complex/MaterialEnumArrayRenderer.tsx

@@ -39,7 +39,7 @@ export const MaterialEnumArrayRenderer = ({
   ...otherProps
 }: ControlProps & OwnPropsOfEnum & DispatchPropsOfMultiEnumControl) => {
   return (
-    <Hidden xlUp={!visible}>
+    <Hidden xsUp={!visible}>
       <FormControl component='fieldset'>
         <FormGroup row>
           {options.map((option: any, index: number) => {