search-provider: Fix object-path if profile is set
The object path that corresponds to org.gnome.Epiphany.Devel is /org/gnome/Epiphany/Devel, not /org/gnome/EpiphanyDevel.
The object path that corresponds to org.gnome.Epiphany.Devel is /org/gnome/Epiphany/Devel, not /org/gnome/EpiphanyDevel.