users: give all users unlimited favorites.

Let all users have unlimited favorites. Formerly the limit was 10k
favorites for regular members, 20k for Gold, and unlimited for Platinum.

Limiting favorites doesn't make sense since upvotes are unlimited.

app/models/favorite.rb

@@ -29,9 +29,7 @@ class Favorite < ApplicationRecord
     Favorite.transaction do
       User.where(id: user.id).select("id").lock("FOR UPDATE").first
 
-      if user.favorite_count >= user.favorite_limit
-        raise Error, "You can only keep up to #{user.favorite_limit} favorites. Upgrade your account to save more."
-      elsif Favorite.for_user(user.id).where(:user_id => user.id, :post_id => post.id).exists?
+      if Favorite.for_user(user.id).where(:user_id => user.id, :post_id => post.id).exists?
         raise Error, "You have already favorited this post"
       end
 

app/models/user.rb

@@ -436,16 +436,6 @@ class User < ApplicationRecord
         end
       end
 
-      def favorite_limit(level)
-        if level >= User::Levels::PLATINUM
-          Float::INFINITY
-        elsif level == User::Levels::GOLD
-          20_000
-        else
-          10_000
-        end
-      end
-
       def favorite_group_limit(level)
         if level >= User::Levels::BUILDER
           Float::INFINITY
@@ -514,10 +504,6 @@ class User < ApplicationRecord
       User.tag_query_limit(level)
     end
 
-    def favorite_limit
-      User.favorite_limit(level)
-    end
-
     def favorite_group_limit
       User.favorite_group_limit(level)
     end