Lint: Fix Style/TrivialAccessors

See also #1134

Author: sunny

.rubocop_todo.yml

@@ -179,10 +179,6 @@ def self.default_currency
     end
   end
 
-  def self.default_currency=(currency)
-    @default_currency = currency
-  end
-
   # Modified to support thread-local bank override
   def self.default_bank
     # Check for thread-local bank first, then fall back to global default
@@ -218,11 +214,6 @@ def self.locale_backend=(value)
     @locale_backend = value ? LocaleBackend.find(value) : nil
   end
 
-  # @attr_writer rounding_mode Use this to specify the rounding mode
-  def self.rounding_mode=(new_rounding_mode)
-    @rounding_mode = new_rounding_mode
-  end
-
   def self.setup_defaults
     # Set the default bank for creating new +Money+ objects.
     self.default_bank = Bank::VariableExchange.instance
@@ -336,6 +327,11 @@ def self.from_dollars(amount, currency = default_currency, options = {})
   end
 
   class << self
+    attr_writer :default_currency
+
+    # @attr_writer rounding_mode Use this to specify the rounding mode
+    attr_writer :rounding_mode
+
     alias_method :from_cents, :new
   end