append deaccessionDialog.reasons with periods for proper display

[donsizemore]

What this PR does / why we need it: deaccessionDialog.reasons aren't terminated with punctuation but wind up concatenated with other text in run-on sentences

Which issue(s) this PR closes:

Closes #7936

Special notes for your reviewer: none

Suggestions on how to test this: deaccession a dataset, then attempt to view it

Does this PR introduce a user interface change? If mockups are available, please link/include them here: no

Is there a release notes update needed for this change?: no

Additional documentation: none

[pdurbin]

Looks good.

One additional thing to test or at least think about is that you can see the deaccession details in the database with select versionnote,archivenote from datasetversion and the "versionnote" will now have a period after the reason and before the (optional) additional info (screenshot below). I think this is fine. We can't facet on (or GROUP BY) "versionnote" anyway since it's a combination of these two fields. I only mentioned "archivenote" above because that's where the URL goes, like this (from "develop", no period after "IRB request"):

dvndb=> select versionnote,archivenote from datasetversion;
    versionnote     |      archivenote       
--------------------+------------------------
                    | 
 IRB request foobar | https://www.google.com