Default table names don't work for types with generics

[mdiep]

If declare a generic type to be a model, then the default table name will have angle brackets.

struct Foo<V> {
  var id: V
}

extension Foo: PersistDB.Model where V == Int {
  static let schema = Schema<Foo>(
    Foo.init ~ "Bar" // schema is named "Bar" here
    \.id ~ "id"
  )
}

This breaks some of the SQL.