Changes the way of embedding youtube videos from old 'object' to new 'iframe'
original script by Mikhail Khvoinitsky in (2010 https://userscripts-mirror.org/scripts/show/82749 updated in 2020 to add https to remove mixed content error.
code generated by the forum software uses "embed" and a http url. Code generated with right click on youtube uses an iframe and a https url.
