Revert "Allow access to other machines’ configuration"

This reverts commit ea232b1f58.

This breaks the unlock script.

flake.nix

@@ -86,6 +86,16 @@
                     config.file = {
                       path = toString self;
                       useChecksum = true;
+                      filters = [
+                        {
+                          type = "include";
+                          pattern = "/machines/${hostname}/";
+                        }
+                        {
+                          type = "exclude";
+                          pattern = "/machines/*/";
+                        }
+                      ];
                     };
                   });
                   command = targetPath: ''
@@ -162,7 +172,6 @@
 
             {
               _module.args.inputs = inputs;
-              _module.args.machines = self.nixosConfigurations;
             }
 
             # deployment settings