remove italics-related styling for quotations
remove italics-related styling for quotations

This is intended to go with a96f157d7997d70eee1a223c26da0463187fab1d on
the branch of the same name in Aloha-Editor

oerpub/bookish,oerpub/github-bookeditor,oerpub/github-bookeditor,oerpub/github-bookeditor,oerpub/bookish