lib/config: Set UseLargeBlocks to true by default (fixes #5599)

[imsodin]

Fixes #5599, followup to #5405.

[calmh]

It's unclear to me what this would accomplish. In the issue (forum link) it talks about the API. If a config comes in through the API it's expected to be complete. I'm pretty sure our setdefaults stuff doesn't take effect at all on that path. Maybe they could, but it seems tricky. We'd have to instantiate a corresponding object, then run setdefaults on it, then deserialize the JSON on top, to have missing attributes get a default value... In practice I guess you might get away with deserializing the config twice, with a setdefaults inbetween...

[imsodin]

As I understood it, the thread in the forum talks about the default folder, which is generated in main.go through NewFolderconfiguration where defaults do apply.

Edit: I have to admit though, I did do no testing/reproducing on this at all, it seemed self-evident to me.

[AudriusButkevicius]

In any way, this is the right thing to do even if it does not address the bigger fear of what @calmh suggested. Regardless, we want them to be on by default on the default folder. API problem is a separate problem.

Perhaps this should have been disableLargeBlocks which would then do the right thing when adding via API, but I guess would have broken backwards compatibility

[calmh]

Right if this is for the default folder then I understand.