Model: Move calculate_rope_alpha from backend

Makes more sense to use as a utility function. Also clarify how the
vars are set.

Signed-off-by: kingbri <8082010+kingbri1@users.noreply.github.com>

common/model.py

@@ -112,8 +112,6 @@ async def load_model_gen(model_path: pathlib.Path, **kwargs):
     kwargs = {**config.model_defaults, **kwargs}
     kwargs = await apply_inline_overrides(model_path, **kwargs)
 
-    print(kwargs)
-
     # Create a new container
     new_container = await ExllamaV2Container.create(
         model_path.resolve(), False, **kwargs