[Bug]: `containerElement` option for Account Center attaches full Onboard instance rather than just AC component

[lnbc1QWFyb24]

Current Behavior

When passing in an element query string for the containerElement option within the Account Center options, the whole Onboard UI is mounted to the element.

Expected Behavior

I would expect that just the Account Center component would mount to the element so there is greater control of where that component is rendered.

One use case is to be able to position just the Account Center component relative to another element on the page.

Steps To Reproduce

1. Pass in containerElement option
2. See that all of Onboard is rendered to the element that is passed in

What package is effected by this issue?

@web3-onboard/core

Is this a build or a runtime issue?

Runtime

Package Version

core: 2.8.3

Node Version

16.10.0

What browsers are you seeing the problem on?

Chrome

Relevant log output

No response

Anything else?

No response

Sanity Check

• If this is a build issue, I have included my build config. If this is a runtime issue, I have included reproduction steps and/or a Minimal, Reproducible Example.

[Adamj1232]

Development on this is in progress 🎸