DEV: Apply syntax_tree formatting to app/*

app/models/slug_setting.rb

@@ -1,17 +1,13 @@
 # frozen_string_literal: true
 
 class SlugSetting < EnumSiteSetting
-
-  VALUES = %w(ascii encoded none)
+  VALUES = %w[ascii encoded none]
 
   def self.valid_value?(val)
     VALUES.include?(val)
   end
 
   def self.values
-    VALUES.map do |l|
-      { name: l, value: l }
-    end
+    VALUES.map { |l| { name: l, value: l } }
   end
-
 end