Fix bad 'pt' unit definition
Fix bad 'pt' unit definition

'pt' unit has been defined as 1.25 px while it is 4/3 px (~1.33 px).
Relates to issue #4200
Relates to Syres916@3db7496 (despite bug always existed, even before this commit)
Source : https://oreillymedia.github.io/Using_SVG/guide/units.html
Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master