Split the merged mlx LFS rule onto its own line

The bf16 and int8 mlx entries were joined into one malformed line, so
mlx/whisper_tiny_en_mlx_int8.pte was not tracked by LFS on a fresh clone.

.gitattributes

@@ -37,6 +37,7 @@ xnnpack/whisper_tiny_en_xnnpack.pte filter=lfs diff=lfs merge=lfs -text
 xnnpack/whisper_tiny_en_xnnpack_fp32.pte filter=lfs diff=lfs merge=lfs -text
 xnnpack/whisper_tiny_en_xnnpack_int8.pte filter=lfs diff=lfs merge=lfs -text
 coreml/whisper_tiny_en_coreml_fp16.pte filter=lfs diff=lfs merge=lfs -text
-mlx/whisper_tiny_en_mlx_bf16.pte filter=lfs diff=lfs merge=lfs -textmlx/whisper_tiny_en_mlx_int8.pte filter=lfs diff=lfs merge=lfs -text
+mlx/whisper_tiny_en_mlx_bf16.pte filter=lfs diff=lfs merge=lfs -text
+mlx/whisper_tiny_en_mlx_int8.pte filter=lfs diff=lfs merge=lfs -text
 vulkan/whisper_tiny_en_vulkan_fp16.pte filter=lfs diff=lfs merge=lfs -text
 vulkan/whisper_tiny_en_vulkan_int8.pte filter=lfs diff=lfs merge=lfs -text