convert: fix ty type-check for GraniteSpeechMmprojModel registration

Author: ReinforcedKnowledge

convert_hf_to_gguf.py

@@ -12452,7 +12452,7 @@ def modify_tensors(self, data_torch, name, bid):
         yield from super().modify_tensors(data_torch, name, bid)
 
 
-@ModelBase.register("GraniteSpeechForConditionalGeneration", ModelType.MMPROJ)
+@ModelBase.register("GraniteSpeechForConditionalGeneration")
 class GraniteSpeechMmprojModel(MmprojModel):
     has_vision_encoder = False
     has_audio_encoder = True