修复select2 和avalon无法一起执行的问题

注销了 2905  clearSearch 方法中的

this.search.val("").widht(10) 这地方
// multi
clearSearch: function () {
var placeholder = this.getPlaceholder(),
maxWidth = this.getMaxSearchWidth();

if (placeholder !== undefined  && this.getVal().length === 0 &&
this.search.hasClass("select2-focused") === false) {
this.search.val(placeholder).addClass("select2-default");
// stretch the search box to full width of the container so as much of
the placeholder is visible as possible
// we could call this.resizeSearch(), but we do not because that
requires a sizer and we do not want to create one so early because of a
firefox bug, see #944
this.search.width(maxWidth > 0 ? maxWidth :
this.container.css("width"));
} else {
//this.search.val("").width(10);
}
},