Use at least one scene even if the conditions are not met

[nExmond]

Issue Link 🔗

#377 EKWindow does not appear on the screen in version iOS 13 or later

Goals 🥅

Makes the EKWindow appear on the screen even when no scene is active.

Implementation Details ✏️

I've improved it to use at least one scene if there are no candidate scenes.

Testing Details 🔍

The problematic situation sometimes occurs when you show different types of entries in succession within a short period of time.