Peft safetensors. (#1364)

Works by removing adapter_model.safetensors from being detected as the
core model file (which skips the real peft detection).

# What does this PR do?

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Fixes # (issue)


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server/text_generation_server/utils/hub.py

@@ -48,6 +48,7 @@ def _weight_files_from_dir(d: Path, extension: str) -> List[str]:
                  if f.endswith(extension)
                  and "arguments" not in f
                  and "args" not in f
+                 and "adapter" not in f
                  and "training" not in f]
     return filenames