Make the CSS selector for current playlist item `<img>` more specific so the width is properly constrained.

Hide the `<audio>` element in the playlist to prevent a flicker when loading - MEjs hides the audio element anyway.

See #27525.



git-svn-id: https://develop.svn.wordpress.org/trunk@27742 602fd350-edb4-49c9-b593-d223f7449a82
Fix LTR field handling:
 * Restore .ltr class lost in the conversion to RTL as a build process.
 * Make email and url inputs always LTR.
 * Set an email field on user-edit to be LTR.

props MikeHansenMe, yoavf for initial patches.
fixes #26824.


git-svn-id: https://develop.svn.wordpress.org/trunk@27743 602fd350-edb4-49c9-b593-d223f7449a82