Revert "fix: remove minHeight from in-context discussion sidebar (#1002)" (#1003)

This reverts commit 9396fbd.

Author: awais-ansari

src/courseware/course/sidebar/sidebars/discussions/DiscussionsSidebar.jsx

@@ -30,7 +30,8 @@ function DiscussionsSidebar({ intl }) {
     >
       <iframe
         src={`${discussionsUrl}?inContext`}
-        className="d-flex w-100 h-100 border-0"
+        className="d-flex w-100 border-0"
+        style={{ minHeight: '60rem' }}
         title={intl.formatMessage(messages.discussionsTitle)}
       />
     </SidebarBase>