Make BrokerUpdater obey file structure

[THISISDINOSAUR]

Task/Issue URL: https://app.asana.com/0/1203581873609357/1208362583268535/f
Tech Design URL:
CC:

Description:
Not doing this makes it way too easy to accidentally use the fake brokers in prod, which windows has already fallen foul of.

Steps to test this PR:

1. In the DBP package, in resources, there is one json file at the top level, rename it so fake isn't in the name. I changed fake to fish.
2. In the actual json file itself, change its name to something you'll recognize
3. Go into the JSON subdirectory, and change the name of one of those to something you'll recognize (the actual name in the JSON itself)
4. Start the app
5. Go to the debug menu, under PIR force a broker update
6. In the same menu run PIR in debug mode
7. Look in the list of brokers for the ones you renamed. You SHOULD see the one in the subdirectory, you SHOULDN'T see the one from the top level (so if you named them the same as me, there should be no fish)
8. You can also use the DB browser to check

Definition of Done:

• Does this PR satisfy our Definition of Done?

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Internal references:

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[THISISDINOSAUR]

An unfortunate sacrifice to preserve the file structure. Although I don't think it will actually affect anything for now since we don't have e.g. any images in here

[aataraxiaa]

Yeah exactly, I think it’s fine for JSON 👍🏼

[aataraxiaa]

Tested and looks good to me 👍🏼