neovim: correctly add python packages

common.nix

@@ -53,7 +53,6 @@
     hledger
     hledger-diff
     cmake
-    pythonPackages.websocket_client # for ensime-vim
     mpv
     wireshark-gtk
     mutt
@@ -112,6 +111,10 @@
           sha256 = "ccc48970ebe2dd093ac2cf4adfe66b143090feca160c9dc9e4f6744eed11f25b";
         };
       });
+
+    neovim = pkgs.neovim.override {
+      extraPythonPackages = [ pkgs.pythonPackages.websocket_client ];
+    };
   };
 
   nixpkgs.config.allowTexliveBuilds = true;