Fix method visibility issues

All of these were caught by the spec_plugin_vis rake task.

lib/sequel/extensions/auto_cast_date_and_time.rb

@@ -45,8 +45,6 @@
 #
 module Sequel
   module AutoCastDateAndTime
-    private
-
     # :nocov:
 
     # Mark the datasets as requiring sql standard date times.  This is only needed
@@ -57,6 +55,8 @@ def requires_sql_standard_datetimes?
     end
     # :nocov:
 
+    private
+
     # Explicitly cast SQLTime time objects to TIME.
     def literal_sqltime_append(sql, v)
       sql << "TIME "

spec/extensions/pg_array_spec.rb

@@ -8,13 +8,14 @@
   before do
     @db = Sequel.connect('mock://postgres')
     @db.extend_datasets(Module.new do
+      def quote_identifiers?; false end
+      private
       def default_time_format
         "'%H:%M:%S'"
       end
       def default_timestamp_format
         "'%Y-%m-%d %H:%M:%S'"
       end
-      def quote_identifiers?; false end
     end)
     @db.extension(:pg_array)
     @m = Sequel::Postgres

spec/extensions/pg_multirange_spec.rb

@@ -11,13 +11,14 @@ def @db.server_version(*) 140000 end
     @R = Sequel::Postgres::PGRange
     @MR = Sequel::Postgres::PGMultiRange
     @db.extend_datasets do
+      def quote_identifiers?; false end
+      private
       def default_time_format
         "'%H:%M:%S'"
       end
       def default_timestamp_format
         "'%Y-%m-%d %H:%M:%S'"
       end
-      def quote_identifiers?; false end
     end
     @db.extension(:pg_array, :pg_multirange)
   end

spec/extensions/pg_range_spec.rb

@@ -9,13 +9,14 @@
     @db = Sequel.connect('mock://postgres')
     @R = Sequel::Postgres::PGRange
     @db.extend_datasets do
+      def quote_identifiers?; false end
+      private
       def default_time_format
         "'%H:%M:%S'"
       end
       def default_timestamp_format
         "'%Y-%m-%d %H:%M:%S'"
       end
-      def quote_identifiers?; false end
     end
     @db.extension(:pg_array, :pg_range)
   end