Ember-power-select: selectChoose helper breaks because of basic-dropdown [aria-owns] update

[Pixelik]

Hi @cibernox,

ember-basic-dropdown was recently updated and now aria-owns will not exist in the trigger unless the dropdown is opened

However, the selectChoose power-select test-helper still assumes that aria-owns will always be there so the latest combination of the two addons breaks in our codebase.

[cibernox]

@Pixelik It has just been fixed. Update EPS.