Do not print Piwik when a custom logo is used (#12325)

plugins/CoreHome/templates/ReportRenderer/_htmlReportHeader.twig

@@ -18,7 +18,7 @@
       <td>
           <a style="font-size:16px;padding:0 15px;color:#ffffff;height: 22px;display: inline-block;vertical-align: inherit;" rel="noreferrer" target="_blank" href="{{ piwikUrl }}" style="lineheight:17px">
               {% if isCustomLogo and logoHeader %}
-                <img src="{{ logoHeader }}" height="20px" width="auto" alt="Piwik, {{ 'General_OpenSourceWebAnalytics'|translate }}" />
+                <img src="{{ logoHeader }}" height="20px" width="auto" />
               {% else %}
                   <img src="{{ piwikUrl }}/plugins/Morpheus/images/logo-email.png" height="20px" width="auto" alt="Piwik, {{ 'General_OpenSourceWebAnalytics'|translate }}" />
               {% endif %}