fix: pfe-accordion-panel

[heyMP]

Description of the issue

pfe-accordion-panel border alignment is out of whack.

Impacted component(s)

• pfe-accordion
• pfe-content-set

Steps to reproduce

1. Go to https://cdpn.io/heyMP/debug/KKvryaL?accordion-with-history=1-2
2. Open first accordion item
3. Verify that the border on the right has an alignment that is no bueno.

Possible solution

1. Go to https://cdpn.io/heyMP/debug/KKvryaL?accordion-with-history=1-2
2. Paste the following into the browser

for (let element of [...document.querySelectorAll('pfe-accordion-panel')]) {
    let style = document.createElement('style')
    style.innerHTML = `:host { box-sizing: border-box; }`;
    element.shadowRoot.prepend(style);
}

Screenshots