fix(llava_onevision2): forward static images to image_processor

The image branch of _build_messages only appended the chat-template entry
but did not push the image into all_pil_images, so generate_until passed
images=None for static-image tasks. The <|image_pad|> placeholders then
had no pixel_values attached and the model produced near-random outputs.

Mirror the video branch and collect the image into all_pil_images so it
is forwarded via images=...

Author: yiyexy

lmms_eval/models/chat/llava_onevision2.py

@@ -305,6 +305,7 @@ def _build_messages(self, chat_message: ChatMessages):
                     content.append({"type": "text", "text": c.text})
                 elif c.type == "image":
                     content.append({"type": "image", "image": c.url})
+                    all_pil_images.append(c.url)
                 elif c.type == "video":
                     if "timestamp" in self.messages_format:
                         video_content, pil_images = self._process_video_with_timestamp(c.url)