[tabs] minor fix (#475)

* [carousel] Fixed this arg in forEach

Should address issue #396

* [carousel] coerce querySelectorAll into an array

Coerce slide nodelist into an Array

* [carousel] ESLint

* [input-group-addon] conditional ID on root element

* [nav-item-dropdown] add ID to root element

* [popover] [tooltip

* Delete popover.js

* [tabs] Minor fix

Rely on testing tab.localActive (current state) rather than tab.active (initial state)

lib/components/tabs.vue

@@ -185,7 +185,7 @@
 
                 // Deactivate any previous active tab(s)
                 this.tabs.forEach( t => {
-                    if (t !== tab && t.active) {
+                    if (t !== tab && t.localActive) {
                         this.$set(t, 'localActive', false);
                     }
                 });