rbac-client doesn't work with an object as a param

[riccardo-forina]

When using rbac-client, if we send a getWorkspace request using inline arguments:

const workspaceId = `foo-bar-baz`
getWorkspace(workspaceId, true, {})

we get a properly formed URL:

/api/rbac/v2/workspaces/foo-bar-baz/

If we send a request using a params object - which is the style we'd like to use, so to avoid passing optional args to the call - like so:

const workspaceId = `foo-bar-baz`
getWorkspace({ id: workspaceId })

we get a malformed URL:

/api/rbac/v2/workspaces/[object Object]