[Bug] - Canvas demos have two different sizes for close buttons #919

Description

Nicole, Andrew, and Kayla would like to drop the custom styles on the ChatBot close button so that the close buttons in the Canvas demos are consistent in size. This will affect all ChatBots.

This was called out in Felt sprint demo: https://drive.google.com/file/d/14sVBrnKbliW_bCueMEyhMg0ho0nOIT2M/view

Steps to Reproduce

Go to https://chatbot-pr-chatbot-911.surge.sh/patterns/canvas/demo/with-code-editor/

The two close buttons are completely different in size.

Data/JSON Context (if applicable)

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Environment

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Screenshots or Logs

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Jira Issue: PF-4717