[Bugfix] Fix GLM-4.1-V video prompt update (#20635)

Signed-off-by: Isotr0py <2037008807@qq.com>

vllm/model_executor/models/glm4_1v.py

@@ -65,7 +65,7 @@ from vllm.multimodal.parse import (ImageSize, MultiModalDataItems,
                                    MultiModalDataParser)
 from vllm.multimodal.processing import (BaseMultiModalProcessor,
                                         BaseProcessingInfo, PromptReplacement,
-                                        PromptUpdate)
+                                        PromptUpdate, PromptUpdateDetails)
 from vllm.multimodal.profiling import BaseDummyInputsBuilder
 from vllm.platforms import _Backend
 from vllm.sequence import IntermediateTensors
@@ -1213,7 +1213,10 @@ class Glm4vMultiModalProcessor(BaseMultiModalProcessor[Glm4vProcessingInfo]):
                 placeholder.append(eoi_token_id)
                 placeholder.extend(frame_idx)
             placeholder.append(eov_token_id)
-            return placeholder
+            return PromptUpdateDetails.select_token_id(
+                placeholder,
+                embed_token_id=hf_processor.video_token_id,
+            )
 
         return [
             PromptReplacement(