Description of problem:
Preferred value from VirtualMachinePreference is not overwritten by value in VirtualMachine spec

Version-Release number of selected component (if applicable):
4.14

How reproducible:
100%

Steps to Reproduce:
1.Create a VM with VMPreference in spec (for e.g. win11 vm with windows.11 preference)
2.Overwrite a preferred value in VM spec (for e.g. secureBoot: false)
3.Start VM

Actual results:
Preferred value is not overwritten by value in VM spec

Expected results:
Preferred value is overwritten by value in VM spec

Additional info:
Issue also reproduces on 4.13