Revert "convert : fix missing ftype for gemma (ggml-org#5690)"

This reverts commit 54fbcd2.

Author: jhen0409

convert_hf_to_gguf.py

@@ -2765,7 +2765,6 @@ def set_gguf_parameters(self):
         self.gguf_writer.add_layer_norm_rms_eps(self.hparams["rms_norm_eps"])
         self.gguf_writer.add_key_length(hparams["head_dim"])
         self.gguf_writer.add_value_length(hparams["head_dim"])
-        self.gguf_writer.add_file_type(self.ftype)
 
     def modify_tensors(self, data_torch: Tensor, name: str, bid: int | None) -> Iterable[tuple[str, Tensor]]:
         del bid  # unused