[BUGFIX] Manage Language Packs: Render empty column if language pack is downloaded

If a language pack is available for an extension, the matrix now renders
an empty column to fix wrong positioning of the actual download buttons.

Resolves: #89283
Releases: master, 9.5
Change-Id: I100a0c8f4a4db3ed03f86e2fb71c95ec9448b3bb
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61837


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Richard Haeser <richard@maxserv.com>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Richard Haeser <richard@maxserv.com>