fix triple columns not fitting on small screens

src/Orchard.Web/Modules/Orchard.Modules/styles/orchard-modules-admin.css

@@ -18,7 +18,7 @@ html.dyn #main ul.features button { display:none; }
     height:6em;
     margin:0 .5% 1% .5%;
     position:relative;
-    width:32.2%;
+    width:32%;
 }
 
 .features.summary-view .missingDependencies{
@@ -223,4 +223,4 @@ h2.recentlyInstalledModule {padding:0 0 0 40px;}
 
 .dir-rtl .manage {
     float: left;
-}
+}