Remove ActiveRecord patch to ignore limit on text columns

This was fixed upstream in https://github.com/rails/rails/pull/8276,
in Rails 3.2.13 (Mar 18, 2013).

changelogs/unreleased/remove-pg-limit-fix.yml

+---
+title: Remove ActiveRecord patch to ignore limit on text columns
+merge_request: 22406
+author:
+type: other

config/initializers/postgresql_limit_fix.rb

-if defined?(ActiveRecord::ConnectionAdapters::PostgreSQLAdapter)
-  class ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
-    module LimitFilter
-      def add_column(table_name, column_name, type, options = {})
-        options.delete(:limit) if type == :text
-        super(table_name, column_name, type, options)
-      end
-
-      def change_column(table_name, column_name, type, options = {})
-        options.delete(:limit) if type == :text
-        super(table_name, column_name, type, options)
-      end
-    end
-
-    prepend ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::LimitFilter
-
-    class TableDefinition
-      def text(*args)
-        options = args.extract_options!
-        options.delete(:limit)
-        column_names = args
-        type = :text
-        column_names.each { |name| column(name, type, options) }
-      end
-    end
-  end
-end