Dreamfall Chapters: Fix directional lighting in the City

This was another SHADOWS_SCREEN variant, same fix as before. I did have
to leave the pre-emptive fix in to make the cloud texture ("light
cookie?") line up properly - this is likely simply undoing the
correction in the vertex shader, which should not be done for screen
shadows... fortunately the depth is the same, so this undoes cleanly.
Dreamfall Chapters: Pre-emptive fix for other SHADOWS_SCREEN variants