[BUG] No scrolling after opening cart

[mothership-nik-wolf]

Describe the bug

When opening the cart in the latest stable version, it's not possible to scroll the site after closing the cart.
Steps to reproduce:

1. Install shopware-pwa stable with shopware-cli
2. shopware-pwa dev
3. Add a product to the cart
4. open and close the cart
5. No more scrollbar and scrolling not possible

Additional context

It happens because the body-node gets "overflow: hidden;" set as inline-style when opening the cart. But the style does not get reset when closing the cart.

[mothership-nik-wolf]

Seems like this was resolved way back in Oct. 2019 in storefront-ui: https://github.com/DivanteLtd/storefront-ui/pull/368/files#diff-bc3fce3e23c0fbf9c8f016b1832ee04fR63

It should be handled here (https://github.com/DivanteLtd/storefront-ui/blob/develop/packages/vue/src/components/organisms/SfSidebar/SfSidebar.vue#L139) as I understand it, but something is broken :/