default.nix: formatting

src/default.nix

@@ -20,7 +20,7 @@ let
         initramfs_image = self.initramfs;
       };
       kernel        = self.callPackage ./kernel { };
-      userspace = self.callPackage ./userspace { };
+      userspace     = self.callPackage ./userspace { };
       initramfs     = self.callPackage ./initramfs { };
     }))
   .overrideScope' overlay;