tracker: Fix ID of Years' children
tracker: Fix ID of Years' children

Fix generation of ID for each child of 'Years' container.

Pelagicore/Media-Manager-Rygel-patched,jku/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,GNOME/rygel,jku/rygel,GNOME/rygel,luisbg/rygel,Tarnyko/rygel