pass BambaDecoderLayer __init__ args up to super
Author: garrett361
Pull request: yes

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The `BambaDecoderLayer` in `modular_bamba.py` wasn't passing necessary `__init__` args up to its parent class in the `super().__init__()` call.  This PR inserts the necessary args.

CC @fabianlim 

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Comments:
Closing; will consolidate with other changes into a separate PR.