Plasma Bigscreen is broken since switch to Plasma 6

@PureTryOut wrote in https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/61432:

Plasma Bigscreen and it's applications are not part of this release yet

bpo fails to build plasma-bigscreen images (were only enabled for pine64-rockpro64) with:

ERROR: Could not find dependency 'aura-browser'

I'll disable it for now in bpo, creating this issue for future reference.

On what postmarketOS version did you encounter the issue?

• edge (master branch)
• v23.12
• v23.06 (supported until 2024-01-18)

EDIT: related:

• !4883 (closed)
• https://gitlab.postmarketos.org/postmarketos/pmaports/-/merge_requests/4836
• https://postmarketos.org/edge/2024/03/04/plasma-bigscreen-disabled/