client: fix displaying incorrect track number
client: fix displaying incorrect track number

when the track number is not known.

CalebMorris/groovebasin,Qbuer/groovebasin,gorlug/groovebasin,andrewrk/groovebasin,dwrensha/groovebasin,CalebMorris/groovebasin,gorlug/groovebasin,andrewrk/groovebasin,sammcj/groovebasin,dwrensha/groovebasin,Qbuer/groovebasin,neynah/groovebasin,Qbuer/groovebasin,dwrensha/groovebasin,neynah/groovebasin,emersion/groovebasin,neynah/groovebasin,dwrensha/groovebasin,andrewrk/groovebasin,sammcj/groovebasin,emersion/groovebasin,emersion/groovebasin,sammcj/groovebasin,CalebMorris/groovebasin,melissanoelle/groovebasin,melissanoelle/groovebasin,gorlug/groovebasin,melissanoelle/groovebasin