DBaaS: Wrong required resources when editing a cluster

STR:

Go to DB cluster creation and create for example a 3 node pxc
Leave the default values: Memory=2, CPU=1 so required resources are Memory=12, CPU=6
Go to edit cluster once it's ready and check the required resources

Actual result:

Required resources are calculated again, but display memory and CPU as if user were to create another cluster and it indicates that we need another 12GB of memory and 6 CPUs on top of what is already being used

Expected result:

When user is editing existing cluster the required resources should not be displayed (like with disk size) until user increases/decreases memory or CPU and it should show correct values of required resources for the existing cluster instead of required resources for a new cluster

The current values should be shown correctly

Resources order should be CPU > Memory > Disk