[views] fix AddPersonFromEmailAction (closes #3851154)

LinkToEntityAction expects target_etype to be set, not etype.

views.py

@@ -118,7 +118,7 @@ class AddPersonFromEmailAction(action.LinkToEntityAction):
                   & score_entity(lambda x: not x.reverse_use_email))
 
     title = _('add Person use_email EmailAddress object')
-    etype = 'Person'
+    target_etype = 'Person'
     rtype = 'use_email'
     target = 'subject'