fix(menu): prevent default popover color from overriding menu surface

Author: aarondrabeck

menu/internal/_menu.scss

@@ -66,6 +66,7 @@
     overflow: visible;
     // [popover] adds a canvas background
     background-color: transparent;
+    color: inherit;
     opacity: 0;
     z-index: 20;
     position: absolute;