Fix Qwen3-Omni audio_token_id serialization issue (#41192)
Fix Qwen3-Omni audio_token_id serialization by overriding parent's attribute_map
- Override attribute_map in Qwen3OmniMoeThinkerConfig to prevent inheritance of incorrect mapping
- Parent class maps audio_token_id -> audio_token_index, but implementation uses audio_token_id directly
- Fixes issue where custom audio_token_id values were not preserved during save_pretrained/from_pretrained cycles
Fixes #41191
