seed_install read the app's manifest from every library before checking
that it was the linked DroidDeck install, so a manifest in another library
that is not UTF-8 raised past the caller and stopped routing for later
games. It now returns before reading anything but the linked manifest.
An untouched manifest from an older version was migrated even while
steamapps/downloading/<appid> existed; that migration now waits until
Steam is not staging the app, like the rewrite of a queued import.
K11MCH1
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