Change default for always_save_context to True

[athitten]

What does this PR do ?

Set the default value of always_save_context to True as its required to have the context for evaluating NeMo 2.0 ckpt as of now since we are converting it to 1.0 ckpt using this script: convert_nemo2_for_export.py to export to TRTLLM for evaluation.

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