[TD] use Gui::QuantitySpinBox in dialogs

as recently discussed

- also add lost alignment properties

src/Mod/TechDraw/Gui/TaskLineDecor.cpp

@@ -171,7 +171,7 @@ void TaskLineDecor::onColorChanged(void)
 
 void TaskLineDecor::onWeightChanged(void)
 {
-    m_weight = ui->dsb_Weight->value();
+    m_weight = ui->dsb_Weight->value().getValue();
     applyDecorations();
     m_partFeat->requestPaint();
 }