[BUGFIX beta] Make modifier manager 3.22 accept the resolved value directly.

[rwjblue]

When using modifierCapabilities('3.13') (the only allowed value in all released Ember versions) you receive the result of owner.factoryFor directly. If you want the raw value, you have to grab it off of the first argument to createModifier like:

class CustomModifierManager {
  capabilities = modifierCapabilities('3.13');

  constructor(owner) {
    this.owner = owner;
  }

  createModifier(factory, args) {
    let Modifier = factory.class;
    return new Modifier(owner, args)
  }

  // ...snip...
}

In order to align the modifier world with the way helpers and component managers work, this commit changes to passing the owner.factoryFor(...).class directly to createModifier instead.

So the above snippet would be rewritten to:

class CustomModifierManager {
  capabilities = modifierCapabilities('3.22');

  constructor(owner) {
    this.owner = owner;
  }

  createModifier(Modifier, args) {
    return new Modifier(owner, args)
  }

  // ...snip...
}