removed duplicate use statement

Author: lsmith77

SimpleThingsFormSerializerBundle.php

@@ -16,7 +16,6 @@
 
 use Symfony\Component\HttpKernel\Bundle\Bundle;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 use SimpleThings\FormSerializerBundle\DependencyInjection\CompilerPass\EncoderPass;