Update use statement lists with new Friendica\Database\dba class

- Remove unused use statement
- Remove superfluous use statements (classes in the same namespace)
- Add missing use statements

src/Worker/OnePoll.php

@@ -4,9 +4,11 @@
  */
 namespace Friendica\Worker;
 
+use Friendica\BaseObject;
 use Friendica\Content\Text\BBCode;
 use Friendica\Core\Config;
 use Friendica\Core\PConfig;
+use Friendica\Database\dba;
 use Friendica\Database\DBM;
 use Friendica\Model\Contact;
 use Friendica\Model\Item;
@@ -15,7 +17,6 @@ use Friendica\Protocol\PortableContact;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Network;
 use Friendica\Util\XML;
-use dba;
 
 require_once 'include/dba.php';
 
@@ -23,7 +24,7 @@ class OnePoll
 {
 	public static function execute($contact_id = 0, $command = '')
 	{
-		$a = \Friendica\BaseObject::getApp();
+		$a = BaseObject::getApp();
 
 		require_once 'include/items.php';