Fix youtube oauth linking
Fix youtube oauth linking

The _youtube_request_uri() function should return a string, not a tuple.
(cherry picked from commit f12140b0def46922f10484a0ef3153cf656f475b)

ReachingOut/unisubs,norayr/unisubs,norayr/unisubs,wevoice/wesub,ujdhesa/unisubs,norayr/unisubs,ReachingOut/unisubs,ofer43211/unisubs,ofer43211/unisubs,wevoice/wesub,norayr/unisubs,wevoice/wesub,ujdhesa/unisubs,ofer43211/unisubs,pculture/unisubs,eloquence/unisubs,pculture/unisubs,ofer43211/unisubs,pculture/unisubs,eloquence/unisubs,ReachingOut/unisubs,ujdhesa/unisubs,eloquence/unisubs,ujdhesa/unisubs,ReachingOut/unisubs,wevoice/wesub,eloquence/unisubs,pculture/unisubs