fix: missing argparse argument static_shape for cutedsl ampere sgemm example

[a-r-r-o-w]

If the example snippet is run with:

python sgemm.py --mnk 4608,3072,3072 --a_major k --b_major k --c_major n

an attribute not found error will be raised:

Running SIMT GEMM example:
Traceback (most recent call last):
  File "sgemm.py", line 859, in <module>
    args.static_shape,
    ^^^^^^^^^^^^^^^^^
AttributeError: 'Namespace' object has no attribute 'static_shape'

[github-actions]

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[a-r-r-o-w]

ping