TpProtocol: parse_default_value: take raw value as a parameter
TpProtocol: parse_default_value: take raw value as a parameter

We previously passed the value when parsed as a string, but that
makes very little sense. The raw value is at least used for something
by the function itself, and it's better for debug messages too.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=71048
Reviewed-by: Guillaume Desmottes <f16649c7afcd84e3350287183c4ed23cb1aea57c@collabora.co.uk>

Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib