Add --release when calling ade

The sdk-persistent-disk.yaml test case suggest using ade to verify that
the persistent disk is working. However ade uses the release version of
the SDK as default value for the sysroot. If two different versions of
the SDK are used, not specifying the release for ade will cause ade
update to fail. This patch adds --release to all calls of ade.

Signed-off-by: Peter Senna Tschudin <peter.senna@collabora.com>