bullet: Fixed calculating of Box dimensions
bullet: Fixed calculating of Box dimensions

        - Fixed wrong claculation of box dimensions, when
        creating BoxShape from solids

Signed-off-by: deflected <4e8b39f4fad01cf7ba570fbff685e6b412438ff4@users.noreply.github.com>

chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d