Rewrite test_setPropertyUser
Rewrite test_setPropertyUser

It now only checks if setProperty is being called on the user changes instance, not what the result of that should be.

Contributes to issue CURA-3497.

hmflash/Cura,fieldOfView/Cura,hmflash/Cura,fieldOfView/Cura,Curahelper/Cura,ynotstartups/Wanhao,ynotstartups/Wanhao,Curahelper/Cura