assorted: remove no-longer-needed sanebox PATH fixes

hosts/common/net/modemmanager.nix

@@ -14,7 +14,6 @@
     # after = [ "polkit.service" ];
     # requires = [ "polkit.service" ];
     wantedBy = [ "network.target" ];  #< default is `multi-user.target`, somehow it doesn't auto-start with that...
-    path = [ "/run/current-system/sw" ];  #< so it can find `sanebox`
 
     # serviceConfig.Type = "dbus";
     # serviceConfig.BusName = "org.freedesktop.ModemManager1";

hosts/common/programs/seatd.nix

@@ -39,8 +39,6 @@ lib.mkMerge [
       wantedBy = [ "multi-user.target" ];
       restartIfChanged = false;
 
-      path = [ "/run/current-system/sw" ];  #< so `sanebox` works
-
       serviceConfig = {
         Type = "simple";
         ExecStart = "${cfg.package}/bin/seatd -g seat";

hosts/common/programs/unl0kr/default.nix

@@ -139,11 +139,6 @@ in
       # N.B.: exec paths here must be absolute. neither systemd nor agetty query PATH.
       serviceConfig.ExecStart = "${pkgs.util-linux}/bin/agetty --login-program '${cfg.config.launcher}/bin/unl0kr-login' --noclear --skip-login --keep-baud ${tty} 115200,38400,9600 $TERM";
 
-      path = [
-        # necessary for `sanebox` to be found. TODO: add this to every systemd service.
-        "/run/current-system/sw"  # `/bin` is appended
-      ];
-
       serviceConfig.Type = "simple";
       serviceConfig.Restart = "always";
       serviceConfig.RestartSec = "5";