[App] fixes for Magnetization property

src/App/FreeCADInit.py

@@ -866,6 +866,7 @@ App.Units.ElectricCurrent       = App.Units.Unit(0,0,0,1)
 App.Units.ElectricPotential     = App.Units.Unit(2,1,-3,-1)
 App.Units.ElectricCharge        = App.Units.Unit(0,0,1,1)
 App.Units.MagneticFluxDensity   = App.Units.Unit(0,1,-2,-1)
+App.Units.Magnetization         = App.Units.Unit(-1,0,0,1)
 App.Units.ElectricalCapacitance = App.Units.Unit(-2,-1,4,2)
 App.Units.ElectricalInductance  = App.Units.Unit(2,1,-2,-2)
 App.Units.ElectricalConductance = App.Units.Unit(-2,-1,3,2)

src/App/PropertyUnits.h

@@ -241,7 +241,7 @@ public:
  * This is a property for representing magnetizations. It is basically a float
  * property. On the Gui it has a quantity like A/m.
  */
-    class AppExport PropertyMagnetization: public PropertyQuantityConstraint
+    class AppExport PropertyMagnetization: public PropertyQuantity
 {
     TYPESYSTEM_HEADER_WITH_OVERRIDE();