fix:修复flex布局传递给 flexItem的disabled属性bug问题 (#4715)

Co-authored-by: ”jiatianqi“ <”jiatianqi@baidu.com“>

packages/amis/src/renderers/Flex.tsx

@@ -117,7 +117,7 @@ export default class Flex extends React.Component<FlexProps, object> {
           (item, key) =>
             render(`flexItem/${key}`, item, {
               key: `flexItem/${key}`,
-              disabled
+              disabled: item?.disabled ?? disabled
             })
         )}
       </div>