Fix cursor positioning on HiDPI systems

lib/system.nix

@@ -20,6 +20,10 @@
                                 ];
 
                                 virtualisation.vmVariant = {
+                                    virtualisation.qemu.options = [
+                                        "-display sdl"
+                                    ];
+
                                     virtualisation.sharedDirectories = {
                                         keys = {
                                             source = "/etc/ssh";