Load danbooru_default_config.rb earlier.

Load danbooru_default_config.rb inside application.rb instead of in an
initializer so that it's available as soon as possible.

config/application.rb

@@ -6,11 +6,13 @@ if defined?(Bundler)
 end
 Bundler.require(*Rails.groups)
 
+require_relative "danbooru_default_config"
+require_relative "danbooru_local_config"
+
 module Danbooru
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
     config.load_defaults 5.1
-    
     config.active_record.schema_format = :sql
     config.encoding = "utf-8"
     config.filter_parameters += [:password]

config/danbooru_default_config.rb

@@ -772,4 +772,10 @@ module Danbooru
       end
     end
   end
+
+  def config
+    @configuration ||= EnvironmentConfiguration.new
+  end
+
+  module_function :config
 end

config/initializers/danbooru_config.rb

@@ -1,10 +0,0 @@
-require "#{Rails.root}/config/danbooru_default_config"
-require "#{Rails.root}/config/danbooru_local_config"
-
-module Danbooru
-  def config
-    @configuration ||= EnvironmentConfiguration.new
-  end
-
-  module_function :config
-end