R1:27104b57c827

Account for raw limits properly in CalendarEventQuery

Summary:
Fixes T8613. This was pretty straightforward, I just never dug into it originally.

`rawResultLimit = 0` just means "no limit", so the fix is to only apply a limit if it is set to some nonzero value.

Also modernize a few pieces of code.

Test Plan: I'm actually not sure this can actually be hit normally? I faked `setGenerateGhosts(true)` into an unrelated query, hit the fatal, then fixed it.

Reviewers: lpriestley, chad

Reviewed By: chad…