FIX: Remove unnecessary audio/video parent element load (PR #10511)

Meta report: https://meta.discourse.org/t/sending-many-requests-for-video-audio-upload-while-editing-post/161487

When typing in the composer we are sending a lot of unnecessary load() requests for the video/audio elements. This line was added months ago before we improved previewing/video thumbnails, which have improved things, so it is no longer required. After removing this line everything still works and no more additional requests are sent.

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https://meta.discourse.org/t/sending-many-requests-for-video-audio-upload-while-editing-post/161487/9