Fix mailer test

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

tests/data/emails/new-account-email-single-button.html

@@ -114,7 +114,7 @@
 				<tr style="padding:0;text-align:left;vertical-align:top">
 					<th style="Margin:0;color:#0a0a0a;font-family:Lucida Grande,Geneva,Verdana,sans-serif;font-size:16px;font-weight:400;line-height:1.3;margin:0;padding:0;text-align:left">
 						<center data-parsed="" style="min-width:490px;width:100%">
-							<table class="button btn default primary float-center" style="Margin:0;border-collapse:collapse;border-spacing:0;display:inline-block;float:none;margin:0;max-height:40px;padding:0;text-align:center;vertical-align:top;width:auto;background:#0082c9;color:#fefefe;background-color:#0082c9;">
+							<table class="button btn default primary float-center" style="Margin:0;border-collapse:collapse;border-spacing:0;display:inline-block;float:none;margin:0;max-height:60px;padding:0;text-align:center;vertical-align:top;width:auto;background:#0082c9;color:#fefefe;background-color:#0082c9;">
 								<tr style="padding:0;text-align:left;vertical-align:top">
 									<td style="-moz-hyphens:auto;-webkit-hyphens:auto;Margin:0;border-collapse:collapse!important;color:#0a0a0a;font-family:Lucida Grande,Geneva,Verdana,sans-serif;font-size:16px;font-weight:400;hyphens:auto;line-height:1.3;margin:0;padding:0;text-align:left;vertical-align:top;word-wrap:break-word">
 										<table style="border-collapse:collapse;border-spacing:0;padding:0;text-align:left;vertical-align:top;width:100%">