fsodeviced: router_alsa: fix construction
fsodeviced: router_alsa: fix construction

NOTE: Always remember there's a difference of the construct()
constructor and an empty ClassName() constructor, the latter will
_not_ be invoked on object creation using GLib.Object.new()

slyon/debian-fso-usaged,slyon/debian-libfsoframework,slyon/debian-fso-deviced,slyon/debian-fso-deviced,slyon/debian-fso-usaged,slyon/debian-libfsoframework