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/Module/Hashtag.php

@@ -6,7 +6,7 @@ namespace Friendica\Module;
 
 use Friendica\BaseModule;
 use Friendica\Core\System;
-use dba;
+use Friendica\Database\dba;
 
 require_once 'include/dba.php';
 require_once 'include/text.php';