chore(vertical-menu): fix coverage

Author: damienrobson-sage

src/components/vertical-menu/responsive-vertical-menu/responsive-vertical-menu-item/responsive-vertical-menu-item.component.tsx

@@ -146,6 +146,7 @@ const BaseItem = forwardRef<HTMLElement, BaseItemProps>(
       let siblingsAtDepth;
 
       // If in responsive mode, do not toggle the menu
+      /* istanbul ignore if */
       if (responsiveDisplay) return;
 
       switch (e.key) {

src/components/vertical-menu/responsive-vertical-menu/responsive-vertical-menu.component.tsx

@@ -202,7 +202,7 @@ const BaseMenu = ({
               reduceMotion={reduceMotion}
               ref={menuRef}
               responsive
-              top={responsiveMode ? "48px" : "40px"}
+              top="48px"
               width={width}
             >
               {children}