Remove unused parameter in plaintext function

Author: AnneCYH

src/sphinx_tags/__init__.py

@@ -112,7 +112,7 @@ def run(self):
         return [result]
 
     def _get_plaintext_node(
-        self, tag: str, file_basename: str, relative_tag_dir: Path
+        self, tag: str, file_basename: str
     ) -> List[nodes.Node]:
         """Get a plaintext reference link for the given tag"""
         link = Path(self.env.app.config.tags_output_dir) / f"{file_basename}/"