[fix] youtube - send CONSENT Cookie to not be redirected

In the EU there exists a "General Data Protection Regulation" [1] aka GDPR (BTW:
very user friendly!) which requires consent to tracking.  To get the consent
from the user, youtube requests are redirected to confirm and get a CONSENT
Cookie from https://consent.youtube.com

This patch adds a CONSENT Cookie to the youtube request to avoid redirection.

[1] https://en.wikipedia.org/wiki/General_Data_Protection_Regulation



Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Reported-by: https://github.com/searx/searx/issues/2774