UI: fixes pki role editing changing to default key parameter values

[hellobontempo]

Fixes a bug that reset key_bits and signature_bits when editing a pki role.

This was happening because the type coming back from the API is an integer but the dropdown options for these params are strings (the API accepts both types). This means the <select> element's selected conditional fails because the values don't initialize as the same type:

// (get @model "keyBits") is a number
// val is a string

selected={{eq (get @model "keyBits") val}}

We're unable to update the option list to be integers because as soon as an option is selected it becomes a string type. See below, Key bits hasn't been edited and is an integer (from the API). Signature bits has been changed in the UI using the dropdown and is now a string:

I also attempted to make a custom transform, however this model uses openApi and the attribute type is overwritten and therefore won't hit the deserialize or serialize methods in a custom transform

[zofskeez]

Nice LGTM!