Fix GFM video element hardcoded width

What does this MR do?

Fixes #17139 (closed)

When including a video in GFM the width is set to a fixed 400. This results in a broken mobile view and a strange looking desktop layout.

Screenshots

image image

With the width set to 100%:

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Does this MR meet the acceptance criteria?

Conformity

This MR only alters only one value. If you need additional informations for this MR pls comment!

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