store away person.id per matched face to support match_add_refimg in context menu

templates/viewer.html

@@ -46,6 +46,7 @@
         {% for face in objs[id].file_details.faces %}
             data = { 'id': '{{face.id}}', 'x': '{{face.face_left}}', 'y': '{{face.face_top}}', 'w': '{{face.w}}', 'h':'{{face.h}}' }
             {% if face.refimg %}
+                data['pid']='{{face.refimg.person.id}}'
                 data['who']='{{face.refimg.person.tag}}'
                 data['distance']="{{face.refimg_lnk.face_distance|round(2)}}"
             {% endif %}