fix(runtime-dom): should not update style if its not change

[btea]

Open the link and follow the steps below:
1、Click the move button, and the left value of div tag will become 20px.
2、Click the add button, the left value of the first div tag should also be 20px.

fix #5772

border and border-* are set at the same time, the browser and unit test rendering results are inconsistent, refer to the following figure

rel vuejs/vue#12946

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[btea]

@yyx990803 I think this fix is ​​necessary, WDYT?

[yyx990803]

I don't think the issue reported in #5772 is valid due to manual manipulation, and this is a bit different from the Vue 2 case as the bug reported in vuejs/vue#12946 isn't reproducible in Vue 3.