fix: remove broken max width from Expression properties (#1455)

Before vs after should be self-explanatory what motivated me to remove
the max-width.

<img width="1353" height="762" alt="image"
src="https://github.com/user-attachments/assets/eda0ce6c-5187-4496-bc92-6f91d1aaa5ee"
/>

Resolves https://github.com/maplibre/maputnik/issues/1445

---------

Co-authored-by: Harel M <harel.mazor@gmail.com>

src/components/modals/ModalSourcesTypeEditor.tsx

@@ -260,7 +260,6 @@ class GeoJSONSourceFieldJsonEditor extends React.Component<GeoJSONSourceFieldJso
       <Block label={t("GeoJSON")} fieldSpec={latest.source_geojson.data}>
         <FieldJson
           value={this.props.source.data}
-          maxHeight={200}
           lintType="json"
           onChange={data => {
             this.props.onChange({