[SSR] lost v-show if style is to binding to an array

[jinzhubaofu]

Version

2.5.15

Reproduction link

https://codepen.io/ludafa/pen/Broxxy

Steps to reproduce

1. npm install vue vue-server-render
2. new a index.js with this code:

const Vue = require('vue')
const app = new Vue({
  template: `<div :style="[{color: a, background: b}]" v-show="c">test</div>`,
  data() {
    return {
      a: 'red',
      b: 'blue',
      c: false
    };
  }
})
const renderer = require('vue-server-renderer').createRenderer()
renderer.renderToString(app, (err, html) => {
  if (err) throw err
  console.log(html)
})

3. run: node index.js

What is expected?

<div data-server-rendered="true" style="color:red;background:blue;display:none;">test</div>

What is actually happening?

<div data-server-rendered="true" style="color:red;background:blue;">test</div>

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