[dbus] Remove additional incorrect variant in GetAll
[dbus] Remove additional incorrect variant in GetAll

The code in GetAll was giving "v" as the signature to conform
individual property values to, and ignoring the specified property
signature, which is wrong.

Instead, open a variant container, and pass the correct signature
when formatting a value.

https://bugzilla.gnome.org/show_bug.cgi?id=619975

joeshaw/gjs,pixunil/cjs,joeshaw/gjs,pixunil/cjs,joeshaw/gjs,magcius/gjs,magcius/gjs,endlessm/gjs,endlessm/gjs,magcius/gjs,djdeath/gjs,pixunil/cjs,pixunil/cjs,mtwebster/cjs,djdeath/gjs,magcius/gjs,endlessm/gjs,magcius/gjs,joeshaw/gjs,endlessm/gjs,joeshaw/gjs,djdeath/gjs,mtwebster/cjs,endlessm/gjs,mtwebster/cjs,djdeath/gjs,pixunil/cjs,mtwebster/cjs,djdeath/gjs,mtwebster/cjs