fix: Auto scroll for courses list (#338)

- Changed overflow of the scroll

Author: orronai

lms/static/my.css

@@ -795,7 +795,7 @@ code .grader-add .fa {
 }
 
 #courses-list {
-  overflow-y: scroll;
+  overflow-y: auto;
   max-height: 10em;
 }