fix(quill): don't go beyond container for bubble (#17475)

Container uses bubble type quill editor, options for which seem to spill
out and hide behind the commend container. This fixes the UI glitch.

ref: https://quilljs.com/docs/configuration/#bounds

frappe/public/js/frappe/form/controls/comment.js

@@ -71,6 +71,7 @@ frappe.ui.form.ControlComment = class ControlComment extends frappe.ui.form.Cont
 		const options = super.get_quill_options();
 		return Object.assign(options, {
 			theme: 'bubble',
+			bounds: this.quill_container[0],
 			modules: Object.assign(options.modules, {
 				mention: this.get_mention_options()
 			})