Sketcher: Bug fix addGeometry list creation and construction lines

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A recent improvement was to allow to create an object (several geometric elements) as construction lines
by providing an additional parameter as true (that defaults to false).

This introduced a bug, that when a list of geometries mixing construction and normal lines was added (with the parameter as false),
construction lines would be converted to normal lines.

This fixes the bug.

src/Mod/Sketcher/App/SketchObject.cpp

@@ -489,7 +489,7 @@ int SketchObject::addGeometry(const std::vector<Part::Geometry *> &geoList, bool
 
     std::vector< Part::Geometry * > newVals(vals);
     for (std::vector<Part::Geometry *>::const_iterator it = geoList.begin(); it != geoList.end(); ++it) {
-        if((*it)->getTypeId() != Part::GeomPoint::getClassTypeId())
+        if(construction && (*it)->getTypeId() != Part::GeomPoint::getClassTypeId())
             const_cast<Part::Geometry *>(*it)->Construction = construction;
 
         newVals.push_back(*it);