Remove stray filter

Fixes https://github.com/composer/packagist/pull/1031#discussion_r332587234

src/Packagist/WebBundle/Resources/views/user/enable_two_factor_auth.html.twig

@@ -34,7 +34,7 @@
 
             <p><small>(This is not an exhaustive list of compatible apps. Packagist does not endorse or recommend one application over another.)</small></p>
 
-            <img src="{{ qr_code_data_uri(provisioningUri|raw) }}" height="200" class="pull-right" />
+            <img src="{{ qr_code_data_uri(provisioningUri) }}" height="200" class="pull-right" />
 
             <h3>Enabling Two-Factor Authentication</h3>