[nifi-registry] chart can not be used with Nifi Registry >= 1.19.0

[jasmdk]

When using the chart with latest Nifi Registry, it never gets into a running state, because the readiness probe keeps getting connetion refused.
This has been observed with security.enabled=false

[real-zony]

+1, I've run into this issue too.

[jrebmann]

I've created a pull request #285 which solves this issue.