fix SearchBar focus bug, ref #650
fix SearchBar focus bug, ref #650

ddcat1115/ant-design-mobile,bccsafe/ant-design-mobile,ddcat1115/ant-design-mobile,ddcat1115/ant-design-mobile,ant-design/ant-design-mobile,ant-design/ant-design-mobile,bccsafe/ant-design-mobile,ant-design/ant-design-mobile,bccsafe/ant-design-mobile,ddcat1115/ant-design-mobile,ant-design/ant-design-mobile,bccsafe/ant-design-mobile,ddcat1115/ant-design-mobile,bccsafe/ant-design-mobile