Don't use setUnlockedDeviceRequired() on the backup key

as importing it with Android 12 GSI fails. This key is only used to restore old backups anyway and the new one doesn't use this restriction.

app/src/main/java/com/stevesoltys/seedvault/crypto/KeyManager.kt

@@ -100,7 +100,9 @@ internal class KeyManagerImpl(
             .setEncryptionPaddings(ENCRYPTION_PADDING_NONE)
             .setRandomizedEncryptionRequired(true)
         // unlocking is required only for decryption, so when restoring from backup
-        builder.setUnlockedDeviceRequired(true)
+        // FIXME disabled for Android 12 GSI as it crashes when importing the key
+        //  KeyStoreException: Failed to import secret key.
+        // builder.setUnlockedDeviceRequired(true)
         return builder.build()
     }