Fix header logo size in notification mails

Signed-off-by: Simon Spannagel <simonspa@kth.se>

lib/private/Mail/EMailTemplate.php

@@ -16,6 +16,7 @@ declare(strict_types=1);
  * @author Morris Jobke <hey@morrisjobke.de>
  * @author Roeland Jago Douma <roeland@famdouma.nl>
  * @author Tomasz Paluszkiewicz <tomasz.paluszkiewicz@gmail.com>
+ * @author Simon Spannagel <simonspa@kth.se>
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -117,8 +118,8 @@ EOF;
 						<table class="row collapse" style="border-collapse:collapse;border-spacing:0;display:table;padding:0;position:relative;text-align:left;vertical-align:top;width:100%%">
 							<tbody>
 							<tr style="padding:0;text-align:left;vertical-align:top">
-								<center data-parsed="" style="background-color:%s;min-width:150px;padding:50px 0;border-radius:200px">
-									<img class="logo float-center" src="%s" alt="%s" align="center" style="-ms-interpolation-mode:bicubic;Margin:0 auto;clear:both;display:block;float:none;margin:0 auto;outline:0;text-align:center;text-decoration:none" height="50">
+								<center data-parsed="" style="background-color:%s;width:150px;height:150px;padding:0px;position:relative;border-radius:200px">
+									<img class="logo float-center" src="%s" alt="%s" align="center" style="-ms-interpolation-mode:bicubic;clear:both;display:block;float:none;outline:0;text-align:center;text-decoration:none;position:absolute;max-height:100px;max-width:100px;width:auto;height:auto;position:absolute;top:0;bottom:0;left:0;right:0;margin:auto;">
 								</center>
 							</tr>
 							</tbody>