Revert changes that broke discussion profile design

lms/static/sass/discussion/_layouts.scss

 // Layouts for discussion pages
 @import '../course/base/extends';
 
+.discussion-user-profile-board {
+
+    .discussion-profile-title {
+        margin-bottom: $baseline / 5;
+        font-size: $forum-x-large-font-size;
+    }
+
+    .discussion-profile-count {
+        margin-top: $baseline / 4;
+    }
+
+    .discussion-profile-info {
+        @include margin-right($baseline);
+    }
+
+    .user-name {
+        @include margin-right($baseline);
+        font-size: $forum-x-large-font-size;
+    }
+
+    .user-roles {
+        font-size: $forum-small-font-size;
+        font-style: italic;
+    }
+}
+
 .discussion-column {
     min-height: 500px;
 

lms/static/sass/discussion/elements/_navigation.scss

@@ -178,7 +178,7 @@
     padding-left: 0 !important; // should *not* be RTLed, see below for explanation
     min-height: 60px;  // @TODO: Remove this when we have a real empty state for the discussion thread list
     margin: 0;
-    overflow-y: scroll;
+    overflow-y: auto;
     list-style: none;
     border-radius: 0 0 3px 3px;