wrong RDNN for dbus service

[decathorpe]

The dbus service file is still named org.elementary.contractor.service, everything is being moved to io.elementary.* namespace.

[leftboardcuttenstring]

Hello! I'd like to work on this. Is it still relevant? I'm planning to rename the DBus service to io.elementary.contractor (in the file data/org.elementary.contractor.service.in) and update the references in other files in the src/ directory. Should I do it for the whole repository in one PR? And one more question: should I rename name of the org.elementary.contractor.service.in file?