fix CSS coding style

apps/files_external/css/settings.css

@@ -16,7 +16,8 @@ tr:hover>td.remove>img { visibility:visible; cursor:pointer; }
 	width: 150px;
 }
 
-#externalStorage td.configuration, #externalStorage td.backend {
+#externalStorage td.configuration,
+#externalStorage td.backend {
 	white-space: normal;
 }