fix: tool parameter mapping for chat completions (#156)

Author: agarcher

lib/openai/resources/chat/completions.rb

@@ -140,7 +140,10 @@ def create(params)
                 name = func[:name] ||= params.name.split("::").last
                 tool_models.store(name, params)
                 func.update(parameters: params.to_json_schema)
+
+                tool
               else
+                tool
               end
             end
             tools.replace(mapped)