BURs: don't try to move wikis/artists twice.

* Remove unnecessary rename_aliased_pages option. This option was always enabled.
* Don't try to rename the artist and wiki page inside AliasAndImplicationImporter
  when an alias is approved. This is already handled by TagAlias#process!.

test/unit/alias_and_implication_importer_test.rb

@@ -92,8 +92,9 @@ class AliasAndImplicationImporterTest < ActiveSupport::TestCase
       tag2 = create(:tag, name: "bbb")
       wiki = create(:wiki_page, title: "aaa")
       artist = create(:artist, name: "aaa")
-      @importer = AliasAndImplicationImporter.new("create alias aaa -> bbb", "", "1")
+      @importer = AliasAndImplicationImporter.new("create alias aaa -> bbb", "")
       @importer.process!
+      perform_enqueued_jobs
       assert_equal("bbb", artist.reload.name)
       assert_equal("bbb", wiki.reload.title)
     end