Homeless calculations should be using residents and not occupants_night or occupants_avg

[nicolepaul]

It seems that the homeless calculations are using occupants_avg or occupants_night and not residents currently.

• oq-engine/openquake/risklib/scientific.py

  Lines 1653 to 1654 in f90729b

  	elif consequence == 'homeless':
  	return dmgdist @ coeffs * asset['occupants_avg']

• oq-engine/openquake/risklib/scientific.py

  Lines 1669 to 1670 in f90729b

  	elif consequence == 'homeless':
  	return aval['occupants_night']

More background here: #8788

[raoanirudh]

Also reported in #7162 (comment)

[ptormene]

Done in https://github.com/gem/oq-engine/pull/8940/files#diff-a31b5ab45e41983d8dd190db30ea3b8536ddb09fac5a44a1f282d1e729a24c23R81
but still not merged.