Class propagation on Select is incompatible with Buefy for Vue 2

[kikuomax]

Overview of the problem

Buefy version: 0.1.2
Vuejs version: 3.3.4
OS/Browser: do not care

Description

@kikuomax, something related to this here... while testing version 0.1.2, I noticed that some situations where I was passing classes to the <b-select> component where conflicting with the Vue 2 behavior.

Previously, something like this:

<b-select :class="my-select">
   ....

Would result in this:

<div class="control my-select">
   <span class="select">
      <select>
         ....

Now, the same code output this:

<div class="control">
   <span class="select">
      <select class="my-select">
         ....

Which I guess is fine... if it wouldn't break much of the logic that I had so far... Is there a way to disable this new behavior? I know it happens due to this.

Originally posted by @mateuswetah in #16 (comment)

Steps to reproduce

See description.

Expected behavior

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Actual behavior

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