machines: aramis: hardware: fix trackpoint device

My trackpoint, and its buttons, had stopped working a while ago. Before
that, I regularly had problems where the cursor jumped around randomly,
or the buttons stopped working.

This seems to have fixed it.

machines/aramis/hardware.nix

@@ -29,6 +29,8 @@
       enable = true;
 
       emulateWheel = true; # Holding middle buttons allows scrolling
+
+      device = "TPPS/2 Elan TrackPoint"; # Use the correct device name
     };
   };
 }