[NcRichText] Add style to mount point for custom picker and custom widget elements #6108
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Mounting in Vue 3 does not replace the mount point but sets its innerHTML. So the mount point needs to be styled to take all the space in its container.
This does not affect custom elements mounted with Vue 2 because the mount point is replaced so it disappears.
It will only fix custom elements mounted with Vue 3.
This can be forward-ported to next.