Collapse: fix accordion panel name=0 closing issue (#3546)

packages/collapse/src/collapse.vue

@@ -42,7 +42,7 @@
       handleItemClick(item) {
         if (this.accordion) {
           this.setActiveNames(
-            this.activeNames[0] &&
+            (this.activeNames[0] || this.activeNames[0] === 0) &&
             this.activeNames[0] === item.name
             ? '' : item.name
           );