[custom select] Make keyboard navigation work for multiple choice select -- Fixes: #4039
[custom select] Make keyboard navigation work for multiple choice select -- Fixes: #4039

npmcomponent/cbou-jquery-mobile,startxfr/jquery-mobile,arschmitz/jquery-mobile,startxfr/jquery-mobile,hinaloe/jqm-demo-ja,hinaloe/jqm-demo-ja,startxfr/jquery-mobile,arschmitz/uglymongrel-jquery-mobile,hinaloe/jqm-demo-ja,arschmitz/uglymongrel-jquery-mobile,npmcomponent/cbou-jquery-mobile,npmcomponent/cbou-jquery-mobile,arschmitz/jquery-mobile,arschmitz/jquery-mobile,arschmitz/uglymongrel-jquery-mobile