[BUGFIX] Fix handling of type "comment" in TypoScript Constant Editor

According to the documentation, the boolean checkbox for type "comment"
should behave in the following way:
- checked= “”
- not-checked = “#”

The handling of this behaviour was faulty in the TypoScript Constant
Editor. This means, every time the constants were saved without changing
the "comment" checkbox, its value was reversed.
Further information:
https://docs.typo3.org/m/typo3/reference-typoscript/master/en-us/UsingSetting/TheConstantEditor.html

Resolves: #82208
Releases: master, 9.5
Change-Id: I1473b435e37b47c4563f0d245e09b1680c738bcd
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63518


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Benni Mack <benni@typo3.org>