Fixes CI

Author: bladyjoker

testsuites/lbt-plutus/lbt-plutus-purescript/build.nix

@@ -32,7 +32,7 @@ _:
               pkgs.nodejs_16
               pkgs.bashInteractive
               pkgs.fd
-            ] + config.settings.shell.tools;
+            ] ++ config.settings.shell.tools;
           shellHook = config.settings.shell.hook;
         };