info: Fix "Graphics" entry with NVidia proprietary drivers
DRI_PRIME=1 won't do anything when the NVidia driver is used for the second "discrete" GPU, so also set the envvars necessary to fetch the right GPU name from the gnome-session helper.
DRI_PRIME=1 won't do anything when the NVidia driver is used for the second "discrete" GPU, so also set the envvars necessary to fetch the right GPU name from the gnome-session helper.