[FIX] website: do not duplicate iframes at each edition

Before this commit, when an user added a video in his page (an <iframe>)
it was then duplicated each time the snippet in which the video is was
edited and saved again, slowing the page loading.

As the code responsible for that is quite outdated, it should be
reviewed and refactored in master. This commit only fixes the problem
with more code. This commit will also fix existing databases, if the
user edit the video snippet once again.

(Note: even if this commit's code will be even more strange in master,
it *should* be forward-ported anyway).

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