Simplify budget stats in voting phase

So we only show the total number of participants, and not divided by web
participants and booth participants.

app/models/budget/stats.rb

@@ -6,8 +6,7 @@ class Budget::Stats
     super +
       %i[total_participants_support_phase total_participants_vote_phase
          total_budget_investments total_votes total_selected_investments
-         total_unfeasible_investments total_supports headings
-         total_participants_web total_participants_booths]
+         total_unfeasible_investments headings]
   end
 
   def participants
@@ -24,14 +23,6 @@ class Budget::Stats
       voters.uniq.count
     end
 
-    def total_participants_web
-      (balloters - poll_ballot_voters).uniq.compact.count
-    end
-
-    def total_participants_booths
-      poll_ballot_voters.uniq.count
-    end
-
     def total_participants_vote_phase
       (balloters + poll_ballot_voters).uniq.count
     end
@@ -52,10 +43,6 @@ class Budget::Stats
       budget.investments.unfeasible.count
     end
 
-    def total_supports
-      supports(budget).count
-    end
-
     def authors
       budget.investments.pluck(:author_id)
     end