youtube: Fix case of a string in the unit tests
youtube: Fix case of a string in the unit tests

Looks like Google changed how they treat cases of usernames in URIs.

Pecisk/libgdata-gtasks,Distrotech/libgdata,Pecisk/libgdata-gtasks,Pecisk/libgdata,Pecisk/libgdata-gtasks,GNOME/libgdata,Distrotech/libgdata,pwithnall/libgdata,Pecisk/libgdata,Pecisk/libgdata,pwithnall/libgdata,Distrotech/libgdata