check and intercept run-python marco in md_to_pptx

Author: bowenliang123

tools/md_to_pptx/md_to_pptx.py

@@ -32,7 +32,7 @@ def _invoke(self, tool_parameters: dict) -> Generator[ToolInvokeMessage, None, N
         pptx_template_file: Optional[File] = tool_parameters.get("pptx_template_file")
 
         # check parameters
-        if "```run-python" in md_text:
+        if "``` run-python" in md_text:
             raise ValueError("The `run-python` marco of md2pptx is not allowed.")
         if pptx_template_file and not isinstance(pptx_template_file, File):
             raise ValueError("Not a valid file for pptx template file")