White balance presets for Panasonic DC-G91

[bilddateien]

This was sent to me to forward to the developers ... which I am happy to do herewith.
darktable-whitebalance-20230424.tar.gz

[kmilos]

Unfortunately cannot be added as-is for the same aliasing reasons as #14131 @TurboGit

The presets are not identical to the ones found on the "base" (in this case US version DC-G95) model.

Thanks for the data though!