fix(core): change modalWidth of inlineObjects to 1 by default (#5839)

* fix(core): change modalWidth of reference to 1 by default

* fix(core): add default width of inlineObject to be 1

Author: ninaandal

packages/sanity/src/core/form/inputs/PortableText/object/modals/ObjectEditModal.tsx

@@ -42,7 +42,7 @@ export function ObjectEditModal(props: {
     onClose()
   }, [onClose])
 
-  const modalWidth = schemaModalOption?.width
+  const modalWidth = schemaModalOption?.width || 1
 
   if (modalType === 'popover') {
     return (