Fix focus on select

Focus should go back to select2-focusser, not select2-choice.

select2.js

@@ -2225,7 +2225,7 @@ the specific language governing permissions and limitations under the Apache Lic
             this.close();
 
             if (!options || !options.noFocus)
-                this.selection.focus();
+                this.focusser.focus();
 
             if (!equal(old, this.id(data))) { this.triggerChange({added:data,removed:oldData}); }
         },