NIFI-11247: Using parameterContextName instead of group name when fet…

[gresockj]

…ching parameters

Summary

NIFI-11247

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[mtien-apache]

Reviewing.

[mtien-apache]

LGTM! Tested by first exporting a flow definition with a parameter context created from a parameter provider. I cleared NiFi, imported that flow definition and was able to see the parameter provider. Then I was able to create a parameter context from the provider. Thanks for the fix, @gresockj!