fix(nvim): Add empty parameters to ls_tool

Author: Zhe Yu

lua/vectorcode/integrations/codecompanion/ls_tool.lua

@@ -63,6 +63,7 @@ return function(opts)
 Retrieve a list of projects accessible via the VectorCode tools.
 Where relevant, use paths from this tool as the `project_root` parameter in other vectorcode tools.
 ]],
+        parameters = { type = "object" },
       },
     },
     output = {