(PUP-11993) Style/StructInheritance

This commit enables the Style/StructInheritance cop and fixes 5
autocorrectable offenses.

Author: AriaXLi

.rubocop_todo.yml

@@ -728,11 +728,6 @@ Style/StringLiterals:
 Style/StringLiteralsInInterpolation:
   Enabled: false
 
-# This cop supports safe auto-correction (--auto-correct).
-Style/StructInheritance:
-  Exclude:
-    - 'lib/puppet/settings.rb'
-
 # This cop supports safe auto-correction (--auto-correct).
 # Configuration parameters: EnforcedStyle, MinSize.
 # SupportedStyles: percent, brackets

lib/puppet/settings.rb

@@ -841,7 +841,7 @@ def reuse
     use(*new)
   end
 
-  class SearchPathElement < Struct.new(:name, :type); end
+  SearchPathElement = Struct.new(:name, :type)
 
   # The order in which to search for values, without defaults.
   #