Fixes Copy page functionality and Custom HTML editor styles

[Elena Shorohova (jsorohova)]

Problems:

1. "Copy page" button in the admin view were copying the page title and permalink but not the content.
2. It was impossible to change the height and width of the Custom HTML code widget as the code editor was covering everything else.

Solutions:

1. Fixed the "Copy page" functionality to copy the page content.
2. Fixed positioning of the code editor in the Custom HTML widget.

[github-actions]

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This scan used axe-core 4.3.2 with Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36.