Fix oppia#19847 : Remove overflow bars when hieght is less than max-h…

…ieght. (oppia#19857)

fix-overfowbars-seen-each-time-in-windows

core/templates/components/ck-editor-helpers/ck-editor-4-rte.component.html

@@ -8,7 +8,7 @@
 <style>
   .oppia-rte {
     max-height: 500px;
-    overflow: scroll;
+    overflow-y: auto;
   }
   .oppia-cke-offline-warning {
     background: #eee;