fix: 解决 onLaunch 生命周期中调用 tabBar 相关接口失败的问题

build uni-h5 0.0.16

packages/uni-h5/package.json

 {
 	"name": "@dcloudio/uni-h5",
-	"version": "0.0.15",
+	"version": "0.0.16",
 	"description": "uni-app h5",
 	"main": "dist/index.umd.min.js",
 	"scripts": {

src/core/helpers/protocol/tab-bar.js

@@ -9,6 +9,8 @@ function beforeValidate (params) {
     if (pages[pages.length - 1].$page.meta.isTabBar) {
       isTabBar = true
     }
+  } else if (getApp().$children[0].hasTabBar) {
+    isTabBar = true
   }
   if (!isTabBar) {
     return 'not TabBar page'