fixed single asset selection when maxNumberOfSelections is not 1
fixed single asset selection when maxNumberOfSelections is not 1

mikaoj/BSImagePicker,mikaoj/BSImagePicker,drahot/BSImagePicker,jblorenzo/BSImagePicker,jblorenzo/BSImagePicker,nickfalk/BSImagePicker,nickfalk/BSImagePicker,nickfalk/BSImagePicker,drahot/BSImagePicker,jblorenzo/BSImagePicker