[FIX] website_slides: fix some rating issues

Last review should be a comment. When fetching the last message on a course
the returned message can be a system notification (like "Channel created").
This is not what we want, mostly with the feature allowing to modify the body
of a message. This commit add restriction on the domain fetch last message.

Fix default rating value on popup widget. The conversation ratio (rating 1-10
and 5 stars) was not applied everywhere. So, the number of displayed stars was
doubled. This is now fixed.

Commit linked to task ID 1941250 and PR #31317.

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