chore: Update default settings for Qwen3 235b model

aider/models.py

@@ -526,6 +526,11 @@ class Model(ModelSettings):
         if "qwen3" in model and "235b" in model:
             self.edit_format = "diff"
             self.use_repo_map = True
+            self.system_prompt_prefix = "/no_think"
+            self.use_temperature = 0.7
+            self.extra_params = {
+                "max_tokens": 24000, "top_p": 0.8, "top_k": 20, "min_p": 0.0
+            }
             return  # <--
 
         # use the defaults