saved searches: remove option to disable saved searches.

Remove `SavedSearch.enabled?` checks. There's no need to make saved
searches optional, since Redis is now required to run Danbooru.

app/models/saved_search.rb

@@ -2,10 +2,6 @@ class SavedSearch < ApplicationRecord
   REDIS_EXPIRY = 1.hour
   QUERY_LIMIT = 1000
 
-  def self.enabled?
-    Danbooru.config.redis_url.present?
-  end
-
   concerning :Redis do
     extend Memoist
 

app/models/tag_alias.rb

@@ -95,11 +95,9 @@ class TagAlias < TagRelationship
   def move_saved_searches
     escaped = Regexp.escape(antecedent_name)
 
-    if SavedSearch.enabled?
-      SavedSearch.where("query like ?", "%#{antecedent_name}%").find_each do |ss|
-        ss.query = ss.query.sub(/(?:^| )#{escaped}(?:$| )/, " #{consequent_name} ").strip.gsub(/  /, " ")
-        ss.save
-      end
+    SavedSearch.where("query like ?", "%#{antecedent_name}%").find_each do |ss|
+      ss.query = ss.query.sub(/(?:^| )#{escaped}(?:$| )/, " #{consequent_name} ").strip.gsub(/  /, " ")
+      ss.save
     end
   end