fix(app): webview

# Conflicts:
#	packages/uni-app-plus/dist/view.umd.min.js

src/platforms/app-plus/view/components/web-view/index.vue

@@ -93,7 +93,6 @@ export default {
     }
   },
   mounted () {
-    this._onParentReady(() => {
     this.htmlId = WEBVIEW_ID_PREFIX + this.$page.id
     insertHTMLWebView({
       htmlId: this.htmlId
@@ -103,7 +102,6 @@ export default {
       webviewStyles: this.webviewStyles
     })
     UniViewJSBridge.publishHandler(WEBVIEW_INSERTED, {}, this.$page.id)
-    })
   },
   beforeDestroy () {
     removeHTMLWebView()