Fix voters on booth not being created in dev seeds

There were validation errors because they didn't have officer nor booth
assignments.

db/dev_seeds/polls.rb

@@ -114,12 +114,16 @@ end
 section "Creating Poll Voters" do
 
   def vote_poll_on_booth(user, poll)
+    officer = Poll::Officer.all.sample
+
     Poll::Voter.create!(document_type: user.document_type,
                         document_number: user.document_number,
                         user: user,
                         poll: poll,
                         origin: "booth",
-                        officer: Poll::Officer.all.sample)
+                        officer: officer,
+                        officer_assignment: officer.officer_assignments.sample,
+                        booth_assignment: poll.booth_assignments.sample)
   end
 
   def vote_poll_on_web(user, poll)