Add margin before separator line on 2nd page of theme wizard

static/css/devhub/submission.less

@@ -72,12 +72,16 @@ ol.submit-addon-progress.unlisted {
 
 .submit-buttons,
 #agreement-buttons,
-.addon-submission-process .submission-buttons{
+.addon-submission-process .submission-buttons {
     border-top: 1px dotted #A4CFDE;
     margin-bottom: 0;
     padding-top: .8em;
 }
 
+.addon-submission-process #persona-license {
+    margin-bottom: 1em;
+}
+
 div.done-next-steps {
     p {
         margin-bottom: .3em;