Draft: fix double translation in Draft._PointArray

[vocx-fc]

The nshape.translate() operation is called twice, once inside if hasattr(pts, 'Placement'), and once outside. This results in incorrectly spaced arrays.

We put the second translation in an else clause, so that only one translation is executed.

See forum thread for pictures: Bug: Draft PointArray uses points with twice the spacing

---

• Branch rebased on latest master git pull --rebase upstream master
• Unit tests confirmed to pass by running ./bin/FreeCAD --run-test 0
• Commit message is well-written
• Commit message includes issue #<id> or fixes #<id> where <id> is the associated MantisBT issue id if one exists