[wodml] css fixes for odml writer

(cherry picked from commit 2a73df4)

public/less/_gin.less

@@ -267,3 +267,9 @@ textarea#description {
   border-top-right-radius: 0;
   border-bottom-right-radius: 0;
 }
+
+.textnode.focusable.whitespace {
+    display: none !important;
+}
+
+