[Machines] Change "Current allocation" won't take effect immediately for running vm

Version-Release number of selected components (if applicable):
cockpit-machines-294-1.el9.noarch
cockpit-296-1.el9.x86_64
libvirt-dbus-1.4.1-5.el9.x86_6
libvirt-client-9.3.0-2.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Prepare a shutoff vm.

2. Click edit after memory, change the Maximum allocation to a bigger value by edit and save 

3. Run the vm

4. Click edit after memory, change the Current allocation to a bigger value by edit and save.

The Memory won't change immediately.

5. Shutdown the vm, the memory value is changed to the value set in step4.



Actual results:
The Memory won't change immediately in step 4.



Expected results:
The memory change immediately for running vm when edit  "Current allocation"



Additional info:
With old build like cockpit-machines-291-1.el9.noarch, it works fine.