gh-37655: Removed caching of determinant in LLL for the `NTL:LLL`-algorithm
The method previously computed the square root of the squared
determinant to cache, thus caching the absolute value of the determinant
instead of the determinant. Therefore we remove this caching completely,
which fixes #37236.
URL: https://github.com/sagemath/sage/pull/37655
Reported by: Sebastian A. Spindler
Reviewer(s): Vincent Delecroix
