flipboxAdjustLens

After-calculation of "lens" for flip modes

An adjustment, in pixels to move the lens on the flipbox modes, after the calculation to find center.

Sometimes, external themes don’t play nicely and you’ll need a few pixels either way - in particular, the default bootstrap4 theme needs 5 pixels positive (hardcoded), while most of the 3rd party color themes for bootstrap4 do not require any movement (set it to zero).