Immortal 1.39 — sharp screensaver photos on every Portal

One fix from a user bug report (#12).

Photo-frame screensaver: the built-in web photos are now sharp on every Portal. The default photo feed was requesting a fixed 1280×800 image, so on any display with a different resolution the picture was scaled to fit and looked blurry — notably the portrait Portal Mini (800×1280) and the higher-resolution Portal+ 2nd gen (2160×1440). It now requests photos at the device's actual screen resolution and orientation, so they fill the screen crisply. When an Unsplash key is configured, the feed also picks a portrait or landscape crop to match the screen instead of always asking for landscape.

Provisioned Portals will self-update to this build automatically. To update manually, reinstall immortal.apk.

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