publish: fix textarea padding on firefox

Firefox treats the padding as literal padding;
other browsers treat the padding as part of the writable
area. This sets it as an initial height.

pkg/interface/publish/src/js/components/lib/comments.js

@@ -65,9 +65,10 @@ export class Comments extends Component {
               id="comment"
               name="comment"
               placeholder="Leave a comment here"
-              className={"f9 db border-box w-100 ba b--gray3 pt3 ph3 pb8 br1 " +
+              className={"f9 db border-box w-100 ba b--gray3 pt3 ph3 br1 " +
               "b--gray2-d mb2 focus-b--black focus-b--white-d white-d bg-gray0-d"}
               aria-describedby="comment-desc"
+              style={{height: "4rem"}}
               onChange={this.commentChange}>
             </textarea>
           </div>