[BUG] fused_moe `moe_sorting_dispatch_policy` wrong type

[tpopp]

https://github.com/ROCm/aiter/blob/main/aiter/fused_moe.py#L225

The value is listed as a bool. Later called code treats it as an int. This means there is functionality for ie dispatch_policy=2, but it can't be used by callers because 2 gets cast to 1.