fix regression: apps does not open in the tab

src/SideMenu.vue

@@ -45,7 +45,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
                 v-bind:icon="app.icon"
                 v-bind:label="app.name"
                 v-bind:href="app.href"
-                v-bind:target="targetBlankApps.indexOf(appId) !== -1 ? '_blank' : undefined"
+                v-bind:target="targetBlankApps.indexOf(app.id) !== -1 ? '_blank' : undefined"
             />
         </ul>
     </div>