Fix stylelint errors

Signed-off-by: Julius Härtl <jus@bitgrid.net>

css/viewer.scss

@@ -93,6 +93,7 @@
 		}
 	}
 }
+
 #richdocuments-header {
 	display: flex;
 	& > div .icon-shared,
@@ -102,6 +103,7 @@
 		height: 50px;
 	}
 }
+
 #richdocuments-actions {
 	position: relative;
 	li {