cameras.ini: fix scicam2 half/small_frame off-by-one (nPixelsX=4007, not 4008)

x1=4008 in half_frame/small_frame exceeded the KAI-11002's actual active
width (4007, confirmed via get_properties() on hardware), causing
ArtemisSubframe to reject the call with ARTEMIS_INVALID_PARAMETER.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>