Fix bad surname list after upgrade from bsddb

[prculley]

User was unable to add new person immediately after performing upgrade from older version.

File "C:\Program Files\GrampsAIO64-6.0.1\gramps\gen\db\generic.py", line 2605, in add_to_surname_list
    i = bisect.bisect(self.surname_list, name)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: '<' not supported between instances of 'str' and 'NoneType'

Turns out that upgrade from bsddb did not initialize the surname list; the upgrade code was saving json data with raw_commit, so the usual commit_person code which would have update the surname list was not executed.

Fixes #13807.