Description of problem:

Editing machine pools of multizone clusters, both ROSA classic and OSD, if the user types, in "maximum nodes count", a value over 60 then a wrong error message is shown.

How reproducible:

always

Steps to Reproduce:

1. Edit a machine pool of a multizone cluster, either ROSA classic or OSD, from cluster details or cluster list 
2. Enable autoscaling
3. Type in "maximum nodes count" a value over 60
4. See the error message show below "maximum nodes count".

Actual results:

The message shown is "Input cannot be more than 59.333333333333336"

Expected results:

The message should be "Input cannot be more than 60"