bug #1031 [verify-email] Coding standards - Twig (seb-jean)

This PR was merged into the 1.0-dev branch.

Discussion
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[verify-email] Coding standards - Twig

Hi,
I changed the case to be like the standard coding:
https://twig.symfony.com/doc/3.x/coding_standards.html

Commits
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2210f28 Update twig_template.tpl.php

Author: weaverryan

src/Resources/skeleton/registration/twig_template.tpl.php

@@ -2,8 +2,8 @@
 
 {% block body %}
 <?php if ($will_verify_email): ?>
-    {% for flashError in app.flashes('verify_email_error') %}
-        <div class="alert alert-danger" role="alert">{{ flashError }}</div>
+    {% for flash_error in app.flashes('verify_email_error') %}
+        <div class="alert alert-danger" role="alert">{{ flash_error }}</div>
     {% endfor %}
 
 <?php endif; ?>