[migrations] remove duplicate file

application/migrations/005_add_dxcc_enddate .php

@@ -1,22 +0,0 @@
-<?php defined('BASEPATH') OR exit('No direct script access allowed');
-
-class Migration_add_dxcc_enddate extends CI_Migration {
-
-	public function up()
-	{
-		
-		$fields = array(
-			'end_date' => array('type' => 'datetime')
-		);
-		
-		$this->dbforge->add_column('dxcc', $fields);
-		
-	}
-      
-
-	public function down()
-	{
-		$this->dbforge->drop_column('dxcc', 'end_date');
-	}
-}
-?>