fix(ContextualMenu): fix typing issue

Author: mainframev

packages/react/src/components/ContextualMenu/ContextualMenu.base.tsx

@@ -145,9 +145,7 @@ const NavigationIdleDelay = 250; /* ms */
 const COMPONENT_NAME = 'ContextualMenu';
 
 const _getMenuItemStylesFunction = memoizeFunction(
-  (
-    ...styles: (IStyleFunctionOrObject<IContextualMenuItemStyleProps, IContextualMenuItemStyles> | undefined)[]
-  ): IStyleFunctionOrObject<IContextualMenuItemStyleProps, IContextualMenuItemStyles> => {
+  (...styles: (IStyleFunctionOrObject<IContextualMenuItemStyleProps, IContextualMenuItemStyles> | undefined)[]) => {
     return (styleProps: IContextualMenuItemStyleProps) =>
       concatStyleSetsWithProps(styleProps, getItemStyles, ...styles);
   },