Fix original_push_to_hub fallback

[Thiraput01]

Fixed the incorrect fallback when pushing models to the Hub.

[rolandtannous]

Hello there.
Thank you for your contribution
@danielhanchen
There is no issue in pushing this PR even though calls to unsloth_save_method where this problem happens, will most probably be all replaced by calls to unsloth_generic_save which uses the latest merge logic , as soon as we finish fixing all methods related to gguf conversion.

[danielhanchen]

Thanks!