WebWizard: Remove line break from a requirement message

modules/setup/library/Setup/WebWizard.php

@@ -709,8 +709,8 @@ class WebWizard extends Wizard implements SetupWizard
             'alias'         => 'PDO-MySQL OR PDO-PostgreSQL',
             'description'   => mt(
                 'setup',
-                'A database is mandatory, therefore at least one module PDO-MySQL OR PDO-PostgreSQL for PHP 
-        is required.'
+                'A database is mandatory, therefore at least one module '
+                . 'PDO-MySQL or PDO-PostgreSQL for PHP is required.'
             )
         )));