umbrello/umlwidgets/associationline.cpp function loadFromXMI followup to commit d8fe02e4 :

- On assigning to nX from attribute "endx" add umlScene->fixX().
- On assigning to nY from attribute "endy" add umlScene->fixY().
- In loop reading <point> subelements,
  - in call to point.setX() add umlScene->fixX();
  - in call to point.setY() add umlScene->fixY().

CCBUG: 449622