LinearAdapter: propagate args to _init_adapter

[akoumpa]

What does this PR do ?

Changes:

1. pass params from LinearAdapter's constructor to LinearAdapter._init_adapter -> previously was using _init_adapter's default values
2. switch from dropout 0 to 0.1
   Collection: [Note which collection this PR will affect]

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[github-actions]

beep boop 🤖: 🙏 The following files have warnings. In case you are familiar with these, please try helping us to improve the code base.

---

Your code was analyzed with PyLint. The following annotations have been identified:

************* Module nemo.collections.llm.peft.lora
nemo/collections/llm/peft/lora.py:158:4: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.90/10

---

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• For trivial methods like getter/setters, consider adding # pylint: disable=C0116 inside the function itself
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[github-actions]

[🤖]: Hi @akoumpa 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully

So it might be time to merge this PR or get some approvals

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g