Comment 1 for bug 1450912

The issue here is that quickstart is relying on Juju 1.16 behaviour. There was a
block of code with a comment:

// Remove this whole if block when 1.16 compatibility is dropped.

The code block was removed because 1.18 was our minimum compatibility version.
But it seems we have to restore the 1.16 behaviour. Note that this is not an
upgraded environment where we need to retain compatibility with older
deployments. It is a fresh 1.24 install which should be able to rely on 1.18 and
later behaviour only.