fix : support ai title with markers

pr_agent/tools/pr_description.py

@@ -471,7 +471,16 @@ def _prepare_labels(self) -> List[str]:
 
     def _prepare_pr_answer_with_markers(self) -> Tuple[str, str, str, List[dict]]:
         get_logger().info(f"Using description marker replacements {self.pr_id}")
-        title = self.vars["title"]
+
+        # Remove the 'PR Title' key from the dictionary
+        ai_title = self.data.pop('title', self.vars["title"])
+        if (not get_settings().pr_description.generate_ai_title):
+            # Assign the original PR title to the 'title' variable
+            title = self.vars["title"]
+        else:
+            # Assign the value of the 'PR Title' key to 'title' variable
+            title = ai_title
+
         body = self.user_description
         if get_settings().pr_description.include_generated_by_header:
             ai_header = f"### 🤖 Generated by PR Agent at {self.git_provider.last_commit_id.sha}\n\n"