tag_category.rb: fix windows line endings.

app/logical/tag_category.rb

@@ -2,9 +2,10 @@ class TagCategory
   module Mappings
     # Returns a hash mapping various tag categories to a numerical value.
     def mapping
-      @@mapping ||= Hash[
-          Danbooru.config.full_tag_config_info.map {|k,v|  v["extra"].map {|y| [y,v["category"]]}}
-          .reduce([],:+)]
+      @@mapping ||=
+        Hash[
+          Danbooru.config.full_tag_config_info.map { |k, v| v["extra"].map { |y| [y, v["category"]] }}.reduce([], :+)
+        ]
         .update(Hash[Danbooru.config.full_tag_config_info.map { |k, v| [v["short"], v["category"]] }])
         .update(Hash[Danbooru.config.full_tag_config_info.map { |k, v| [k, v["category"]] }])
     end