competition: fix visit increment

app/controllers/competitions/competitions_controller.rb

@@ -44,6 +44,8 @@ class Competitions::CompetitionsController < Competitions::BaseController
     @competition = current_competition
     @competition_modules = @competition.unhidden_competition_modules
     @user = current_user
+
+    current_competition.increment!(:visits)
   end
 
   def informs