VulnerabilityWeight struct definition uses int for areaperil_id instead of AREAPERIL_INT

[nickramsay19]

struct VulnerabilityWeight
{
	int areaperil_id;
	int vulnerability_id;
	OASIS_FLOAT weight;
};

But in OasisLMF gulmc/aggregate.py VulnerabilityWeight correctly uses areaperil_int for areaperil_id:

VulnerabilityWeight = nb.from_dtype(np.dtype([('areaperil_id', areaperil_int),
                                              ('vulnerability_id', np.int32),
                                              ('weight', np.float32)]))