Asset paths not generated for inline styles

[mfzl]

Version

3.0.0-beta.2

Reproduction link

https://codesandbox.io/s/wz6989r7r5

Steps to reproduce

Run the sandbox and check generated source

<div class="image" style="background-image:url('@/assets/logo.png');"></div>

What is expected?

Correct image link be generated

What is actually happening?

It is as is with '@' in URL

[yyx990803]

This is tracked in vuejs/vue-loader#1113