Nikon 1 V2: appears to actually have whitelevel of 4095.
Nikon 1 V2: appears to actually have whitelevel of 4095.

While dng converter produces wl of 3300 for iso <200,
visual inspection of such an image shows no purple highlight
with whitelevel of 4095.

Closes #11171.

anarsoul/rawspeed,darktable-org/rawspeed,klauspost/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed,anarsoul/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed,klauspost/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,anarsoul/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed