Incorrect toggling of custom classes in accordions

[AngeloKarugo]

When an accordion item is expanded, classes in data-active-classes are removed if they are also present in data-inactive-classes. This is a problem when you want the same classes applied for both when the accordion is open & and when it's closed.

Steps to reproduce:

1. Add an accordion component from the docs
2. Set data-active-classes="foo bar foobar" and data-inactive-classes="foo bar barfoo" on the accordion container element
3. Toggle the accordion
4. Classes foo and bar are removed from the accordion toggle

Expected behavior
All classes in data-active-classes should be present when the accordion is open and all classes in data-inactive-classes should be present when the accordion is closed.