Draft: Fix mixup of TextAlignment vs Justification for Labels

TextAlignment is the vertical alignment, while Justification is the
horizontal alignment. here, get_text was passed the vertical, while it
expected the horizontal. This caused the alignment of a Label to be
wrong in the resulting SVG (e.g. in a TechDraw draft view).

This seems to have been broken since SVG support for Labels was first
introduced in commit d6f8ded4ca (Initial work, only text (no lines)).

src/Mod/Draft/draftfunctions/svg.py

@@ -641,7 +641,7 @@ def get_svg(obj,
             fontname = obj.ViewObject.TextFont
             position = get_proj(obj.Placement.Base, plane)
             rotation = obj.Placement.Rotation
-            justification = obj.ViewObject.TextAlignment
+            justification = obj.ViewObject.Justification
             text = obj.Text
             svg += svgtext.get_text(plane, techdraw,
                                     stroke, fontsize, fontname,