[BUGFIX] Convert line break element in table element wizard

The table element wizard (TCA `renderType=textTable`) stores
serialized table representation in a text field. Previously,
the removed (see #95036) `TableController` substituted those
newline characters by `<br>` tags.

Since there is in general no handling of TCA render types,
this conversion now happens in the corresponding LitElement.

Resolves: #102572
Releases: main, 12.4
Change-Id: I12537b0d649ae28b945a2dc79baeb09a4a6135b1
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82082


Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>