fix(lsp): load the correct lsp in nix-shell

Closes: nix-community#3063

Author: pseudocc

modules/top-level/output.nix

@@ -341,7 +341,7 @@ in
       extraWrapperArgs = builtins.concatStringsSep " " (
         (optional (
           config.extraPackages != [ ]
-        ) ''--prefix PATH : "${lib.makeBinPath config.extraPackages}"'')
+        ) ''--suffix PATH : "${lib.makeBinPath config.extraPackages}"'')
         ++ (optional config.wrapRc ''--add-flags -u --add-flags "${initFile}"'')
       );