modemmanager: remove unused udev input

This is only used to determine the default value of udevdir, which we
set explicitly.

-2
-2
pkgs/tools/networking/modemmanager/default.nix
··· 3 3 , fetchFromGitLab 4 4 , fetchpatch 5 5 , glib 6 - , udev 7 6 , libgudev 8 7 , polkit 9 8 , ppp ··· 62 61 63 62 buildInputs = [ 64 63 glib 65 - udev 66 64 libgudev 67 65 polkit 68 66 ppp