NoScript icon is still visible in context menu after the fix for #25658 landed

A user on the blog noticed that we removed the NoScript toolbar icon but the one in the context menu is still visible. (see: https://blog.torproject.org/comment/280411#comment-280411). Moreover, clicking on it results in an error:

TypeError: this.getPlacementOfWidget(...) is null[Learn More]  CustomizableUI.jsm:1638:18