Soft actor references can no longer be set in DataTables

As part of [Link Removed], it was changed so soft actor references cannot be set in the editor for structure defaults. This is desired because the serialization behavior for defaults is complicated and error prone so could corrupt things.

However, this accidentally caused them to be uneditable in data tables that are instances of this struct, because they are accidentally being detected as "templates" when data tables are not templated data. This is a regression from 4.25, and is a UI only change because you can still import them from CSV/JSON properly

1. Create a user struct with an Actor Soft Object Reference variable. Note that you cannot set the default value of this in the struct editor which is correct
2. Create a data table using this struct, add a row to it
3. Attempt to set the reference in the data table, it is greyed out and gives you the tooltip "Editing this value in structure's defaults is not allowed" which is incorrect as this is not the structure defaults editor