fix(playground): remove redundant vertical scroll bar (#10752)

Author: OnkarRuikar

Diff for: client/src/playground/index.scss

@@ -191,10 +191,10 @@ main.play {
               var(--editor-header-padding) - var(--editor-header-border-width)
           );
           margin: 0.5rem 0 0;
-          overflow: scroll;
+          overflow-y: scroll;
 
           .cm-editor {
-            height: 100%;
+            min-height: 100%;
             width: 100%;
 
             @media screen and (max-width: $screen-sm) {