Remove annoying difference in button heights. (#1853)

* Remove annoying difference in button heights.

Why was that even there?

See before & after: http://imgur.com/a/yKdUR

* (2/2) Remove annoying difference in button heights

public/css/index.css

@@ -1307,7 +1307,6 @@ footer .ui.language .menu {
 }
 .repository.file.list #file-buttons {
   font-weight: normal;
-  margin-top: -3px;
 }
 .repository.file.list #file-buttons .ui.button {
   padding: 8px 10px;

public/less/_repository.less

@@ -163,7 +163,6 @@
 		}
 		#file-buttons {
 			font-weight: normal;
-			margin-top: -3px;
 			.ui.button {
 				padding: 8px 10px;
 				font-weight: normal;