tests/plugins/lz-n: resolve treesitter conflict

Just remove the dependency on treesitter for testing lz-n.

tests/test-sources/plugins/pluginmanagers/lz-n.nix

@@ -74,12 +74,9 @@ in
           dial-nvim
           vimtex
           telescope-nvim
-          nvim-biscuits
           crates-nvim
         ]);
 
-      plugins.treesitter.enable = true;
-
       plugins.lz-n = {
         enable = true;
         plugins = [
@@ -130,16 +127,6 @@ in
                 end
               '';
           }
-          # On event
-          {
-            __unkeyed-1 = "nvim-biscuits";
-            event.__raw = "{ 'BufEnter *.lua' }";
-            after.__raw = ''
-              function()
-              require('nvim-biscuits').setup({})
-              end
-            '';
-          }
           # On command no setup function, priority
           {
             __unkeyed-1 = "telescope.nvim";