calibration-viewer.py - fix bug with pft button for static plots
calibration-viewer.py - fix bug with pft button for static plots

I think that with an updating plot, the update function picks up on the
changed pft number, and this is not a problem, but with a static plot, the
pft changer function didn't actually reload any data.

tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem,tobeycarman/dvm-dos-tem