Merge pull request #215345 from Izorkin/fix-coredump-id

nixos/systemd-coredump: fix group id

nixos/modules/misc/ids.nix

···
       #seeks = 148; # removed 2020-06-21
       prosody = 149;
       i2pd = 150;
+      systemd-coredump = 151;
       systemd-network = 152;
       systemd-resolve = 153;
       systemd-timesync = 154;

nixos/modules/system/boot/systemd/coredump.nix

···
         uid = config.ids.uids.systemd-coredump;
         group = "systemd-coredump";
       };
-      users.groups.systemd-coredump = {};
+      users.groups.systemd-coredump = {
+        gid = config.ids.gids.systemd-coredump;
+      };
     })
 
     (mkIf (!cfg.enable) {