Fix unknown isSmall property in VM create dialog

This changed in PF5.

src/components/create-vm-dialog/createVmDialog.jsx

@@ -817,7 +817,7 @@ const SshKeysRow = ({
                 <Button variant='plain'
                     className="btn-close"
                     id={id + "-btn-close"}
-                    isSmall
+                    size="sm"
                     aria-label={_("Remove item")}
                     icon={<TrashIcon />}
                     onClick={() => removeitem(idx)} />

test/machineslib.py

@@ -434,7 +434,6 @@ def setUp(self):
             "Failed to get libvirt version from the dbus API:.*Cannot recv data: Connection reset by peer",
             # FIXME: React errors on /devel scenario; these are actual bugs!
             'Warning: Each child in a list should have a unique "key" prop',
-            "Warning: React does not recognize the .* prop on a DOM element",
             "Warning: An update .* was scheduled from inside an update function",
             # FIXME:: https://github.com/cockpit-project/cockpit-machines/issues/1272
             "Warning: Failed.*type:.*The prop `format` is marked as required in `VolumeCreateBody`, but its value is `undefined`",