fixed undefined image size (#11246)

plugins/ScheduledReports/templates/_listReports.twig

@@ -81,7 +81,7 @@
                             'format': (report.format in ['html', 'csv']) ? report.format : false
                        }) }}"
                    rel="noreferrer"  target="_blank" name="linkDownloadReport" id="{{ report.idreport }}" class="link_but withIcon">
-                    <img src='{{ reportFormatsByReportType[report.type][report.format] }}' border="0"/>
+                    <img src='{{ reportFormatsByReportType[report.type][report.format] }}' border="0" width="16px" height="16px"/>
                     {{ 'General_Download'|translate }}
                 </a>
             </td>