"Fix" camera scaling
"Fix" camera scaling

Change base scale factor from 10% to 20%.  Re-add scale change to
inactive cameras that was accidentally dropped in 1e83be25f97e.  Fix
incorrect calculation of scale due to the camera representation not
being updated. (We now cause a camera update to also trigger a scale
update, as well as update the representation when computing the scale.
This is a bit redundant and verging on paranoia, but should prevent
accidental errors, and the way we use the dirty flags should ensure we
don't ever actually do more work than needed.)

linus-sherrill/maptk,linus-sherrill/maptk,linus-sherrill/maptk,linus-sherrill/maptk,linus-sherrill/maptk