[UI] Fix Overflow For Pygame Button (hedyorg#3964)

Fixes hedyorg#3963,
Now the scroll bar will only be visible when the buttons do not fit anymore.

when it does fit:
![image](https://user-images.githubusercontent.com/48225550/213882811-2ebbca4d-5075-4e9b-8077-86a789c7d204.png)
when it does not fit:
![image](https://user-images.githubusercontent.com/48225550/213882854-a6c3e0b2-b518-4d5c-80c0-77a18452b9cf.png)

templates/incl-editor-and-output.html

@@ -140,7 +140,7 @@
           </div>
         </div>
       </div>
-      <div id="dynamic-buttons" class="flex mt-3 gap-2 overflow-x-scroll border-4 border-blue-600 rounded bg-blue-300 py-2 px-3" style="display: none">
+      <div id="dynamic-buttons" class="flex mt-3 gap-2 overflow-auto border-4 border-blue-600 rounded bg-blue-300 py-2 px-3" style="display: none">
       </div>
     </div>
     <!-- Col 2: run button (move below editor in single-column layout), level buttons -->