vimeo: encode search text in get_videos_search_params()
vimeo: encode search text in get_videos_search_params()

This is to fix part 2. of https://bugzilla.gnome.org/show_bug.cgi?id=639965#c1

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