Dead code for healthcare features in amenity-points.mss should be removed

[imagico]

See #3731 (comment).

openstreetmap-carto/style/amenity-points.mss

Line 2508 in a2077c0

[feature = 'healthcare_hospital'][zoom >= 16] {

openstreetmap-carto/style/amenity-points.mss

Lines 2526 to 2545 in a2077c0

	[feature = 'healthcare_alternative'],
	[feature = 'healthcare_audiologist'],
	[feature = 'healthcare_birthing_center'],
	[feature = 'healthcare_blood_bank'],
	[feature = 'healthcare_blood_donation'],
	[feature = 'healthcare_centre'],
	[feature = 'healthcare_clinic'],
	[feature = 'healthcare_dentist'],
	[feature = 'healthcare_dialysis'],
	[feature = 'healthcare_doctor'],
	[feature = 'healthcare_laboratory'],
	[feature = 'healthcare_midwife'],
	[feature = 'healthcare_occupational_therapist'],
	[feature = 'healthcare_optometrist'],
	[feature = 'healthcare_physiotherapist'],
	[feature = 'healthcare_podiatrist'],
	[feature = 'healthcare_psychotherapist'],
	[feature = 'healthcare_rehabilitation'],
	[feature = 'healthcare_speech_therapist'],
	[feature = 'healthcare_yes'] {

This code is unused since #3731 and confusing for anyone who wants to implement rendering of healthcare features. It should be removed. See #4402.