[Bug fix] Fix the issue "Can't Override Input Size Attributes"

[souyang]

Fix the bug #2651

Steps to reproduce:

1. Checkout the branch
2. Run npm install && npm run build && npm run playground
3. In src/playground/components/Component.astro, update content to

<div>
  <input class="input input-sm input-primary m-10"></input>
</div>

Then update content to

<div>
  <input class="input input-sm input-primary pl-8 m-10"></input>
</div>

Expected result: the left padding should be updated to 8 px
Actual result: the left padding is unchanged.

Testing Steps:

1. Run npm install && npm run build && npm playground
2. In src/playground/components/Component.astro, update content to

<div>
  <input class="input input-sm input-primary m-10"></input>
</div>

Then update content to

<div>
  <input class="input input-sm input-primary pl-8 m-10"></input>
</div>

Expected result: the left padding should be updated to 8 px
Actula result: the left padding was updated to 8 px