fix: "Course Number Display String" option doesn't influence certificate for Quince

[DmytroAlipov]

This is a backport from the master.

Description

In Advanced Settings, it is possible to redefine the name for the Course Organization as well as for the Course Number. However, a bug was discovered in replacing this name on the certificate:

For Course Number Display String everything works correctly:

But the name of the organization is always taken from the Organizations model. In this case, the definition from Advanced Settings is ignored:

For other pages, the override works correctly for both settings:

I slightly changed the logic for prioritizing the selection of the organization name for the certificate. Now everything is replaced correctly:

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[justinhynes]

I took a look at the changes on the master branch and they look good, I do have an open question on the other branches PR though. I'll keep the focus of the conversation on the other PR, just commenting to let you know this PR is on my radar too.

[justinhynes]

I've approved this change in the master branch (#34465).

This should be good to go.

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