11014 fix rack elevation name sorting

[arthanson]

Fixes: #11014

Fixes rack elevation sorting order for name, use _name instead of name to sort by.

[jeremystretch]

We probably want to avoid exposing the _name field (with the leading underscore) to the user. It might be cleaner to keep name and -name in place, but swap them for _name and -_name respectively when calling order_by().

[arthanson]

We probably want to avoid exposing the _name field (with the leading underscore) to the user. It might be cleaner to keep name and -name in place, but swap them for _name and -_name respectively when calling order_by().

Done