Fix trailing comma tuple bug

[bryevdv]

This is a focused hotfix PR for the bug discovered and fixed in #229 in case it is preferable to merge a smaller PR for now. cc @magnatelee

[bryevdv]

With this PR:

>>> import cunumeric
>>> for k, v in cunumeric.__dict__.items():  
...     if isinstance(v, tuple): print(k, v)
... 
ScalarType (<class 'int'>, <class 'float'>, <class 'complex'>, <class 'int'>, <class 'bool'>, <class 'bytes'>, <class 'str'>, <class 'memoryview'>, <class 'numpy.bool_'>, <class 'numpy.complex64'>, <class 'numpy.complex128'>, <class 'numpy.complex256'>, <class 'numpy.float16'>, <class 'numpy.float32'>, <class 'numpy.float64'>, <class 'numpy.float128'>, <class 'numpy.int8'>, <class 'numpy.int16'>, <class 'numpy.int32'>, <class 'numpy.longlong'>, <class 'numpy.int64'>, <class 'numpy.timedelta64'>, <class 'numpy.datetime64'>, <class 'numpy.object_'>, <class 'numpy.bytes_'>, <class 'numpy.str_'>, <class 'numpy.uint8'>, <class 'numpy.uint16'>, <class 'numpy.uint32'>, <class 'numpy.ulonglong'>, <class 'numpy.uint64'>, <class 'numpy.void'>)
kernel_version (5, 10)

correct compared to actual numpy:

In [68]: >>> for k, v in np.__dict__.items():
    ...: ...     if isinstance(v, tuple): print(k, v)
    ...: 
ScalarType (<class 'int'>, <class 'float'>, <class 'complex'>, <class 'int'>, <class 'bool'>, <class 'bytes'>, <class 'str'>, <class 'memoryview'>, <class 'numpy.bool_'>, <class 'numpy.complex64'>, <class 'numpy.complex128'>, <class 'numpy.complex256'>, <class 'numpy.float16'>, <class 'numpy.float32'>, <class 'numpy.float64'>, <class 'numpy.float128'>, <class 'numpy.int8'>, <class 'numpy.int16'>, <class 'numpy.int32'>, <class 'numpy.longlong'>, <class 'numpy.int64'>, <class 'numpy.datetime64'>, <class 'numpy.timedelta64'>, <class 'numpy.object_'>, <class 'numpy.bytes_'>, <class 'numpy.str_'>, <class 'numpy.uint8'>, <class 'numpy.uint16'>, <class 'numpy.uint32'>, <class 'numpy.ulonglong'>, <class 'numpy.uint64'>, <class 'numpy.void'>)
kernel_version (5, 10)