emails: fixed position of logo in emails, fixes #8094

emails/templates/layouts/default.html

@@ -95,7 +95,6 @@ td[class="stack-column-center"] {
 		<tr>
 			<td class="center" align="center" valign="top">
         <center>
-
 					<table class="row header">
 						<tr>
 						  <td class="center" align="center">
@@ -107,7 +106,7 @@ td[class="stack-column-center"] {
 
 						            <table class="twelve columns">
 						              <tr>
-						                <td class="six sub-columns center">
+						                <td class="twelve sub-columns center">
                               <img class="logo" src="http://grafana.org/assets/img/logo_new_transparent_200x48.png" style="width: 200px; float: none; display: inline">
                             </td>
                             <td class="expander"></td>