Merge pull request #7902 from gertingold/radio

fix margin in RadioButtons

IPython/html/static/widgets/less/widgets.less

@@ -271,9 +271,6 b''
 
     label {
         margin-top: 0px;
+        margin-left: 20px;
     }
 }
-
-.widget-radio {
-    margin-left: 20px;
-}