Add topic selection to inline thread editing, fixing errors

Co-Authored-By: Brian Talbot <btalbot@edx.org>

TNL-549

Conflicts:
	common/static/coffee/spec/discussion/view/discussion_thread_edit_view_spec.js
	common/static/coffee/src/discussion/discussion_module_view.coffee
	common/static/coffee/src/discussion/views/discussion_thread_edit_view.js
	lms/djangoapps/django_comment_client/forum/views.py

lms/static/sass/_shame.scss

@@ -271,3 +271,19 @@ footer .references {
 .course-content .discussion-post.edit-post-form .topic-submenu {
   list-style: none;
 }
+
+// ====================
+
+// poor definition/scope on ul elements inside .vert-mod element in courseware - override needed for inline discussion editing
+.course-content .discussion-post.edit-post-form .topic-menu {
+  padding-left: 0;
+  list-style: none;
+
+  .topic-menu-item {
+    margin-bottom: 0;
+  }
+}
+
+.course-content .discussion-post.edit-post-form .topic-submenu {
+  list-style: none;
+}