youtube: remove c99 code style
youtube: remove c99 code style

This module has variable declarations in a for sentence, which is
only valid for c99, but the dialect is not activated in configure.ac

As the rest of the code don't stick to c99 hence is better just
change these few lines.

Signed-off-by: Víctor Manuel Jáquez Leal <853e0dbb5ddd43a0f0483f24794ae05c4c52af91@igalia.com>

MikePetullo/grilo-plugins,jasuarez/grilo-plugins,kyoushuu/grilo-plugins,MikePetullo/grilo-plugins,jasuarez/grilo-plugins,vrutkovs/grilo-plugins,MikePetullo/grilo-plugins,MathieuDuponchelle/grilo-plugins,kyoushuu/grilo-plugins,vrutkovs/grilo-plugins,GNOME/grilo-plugins,vrutkovs/grilo-plugins,GNOME/grilo-plugins,kyoushuu/grilo-plugins,MathieuDuponchelle/grilo-plugins,MathieuDuponchelle/grilo-plugins,MathieuDuponchelle/grilo-plugins,grilofw/grilo-plugins,vrutkovs/grilo-plugins,grilofw/grilo-plugins