flatpak-coredumpctl: Check for /app as well as /newroot

This fixes a bug where the warning about not being a flatpaked
application was being printed for flatpaks. This was due to a
change in bwrap so that the paths no longer start with /newroot.
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f