media/arte.lua: Arte.to_id: Return ID in lowercase
media/arte.lua: Arte.to_id: Return ID in lowercase

Signed-off-by: Toni Gundogdu <eac2284b3c43676907b96f08de9d3d52d5df0361@gmail.com>

legatvs/libquvi-scripts,alech/libquvi-scripts,alech/libquvi-scripts,legatvs/libquvi-scripts