Fix the check error originating from TALK_lumbermill_fabricate.json

[MNG-cataclysm]

Summary

Bugfixes "Fix the check error coming from TALK_lumbermill_fabricate.json"

Purpose of change

As pointed out here, a check error has originated in this file due to changes made to the trade system. This should fix it.

Describe the solution

Added brackets around the effect entries in trade dialogue.

Describe alternatives you've considered

None.

Testing

This PR should test it. If the error doesn't appear in the tests, it will be fixed.

Additional context

None.

[Maleclypse]

Exception when parsing JSON data type "effect_on_condition"
Error in JSON file: 'data/json/npcs/lumbermill_employees/TALK_lumbermill_fabricate.json'
'effect'
Error in extracting strings from JSON. Aborting.
Error: Process completed with exit code 1.```

[dseguin]

You can undo the other changes if you want. The only fix here is to add the blank "effect" field.

Don't worry about the Text Changes Analyzer failure on the base commit, the merge commit is what matters here.

[MNG-cataclysm]

You can undo the other changes if you want. The only fix here is to add the blank "effect" field.

Don't worry about the Text Changes Analyzer failure on the base commit, the merge commit is what matters here.

Personally, I think the change should be left as-is, just to cover all the bases.