Fix early return when expanding RRULE in CalDav/iCal

[willgittoes]

What does this PR do?

Recurring events in CalDav and iCal were only using the first instance of the event for availability checking. This fixes that issue.

(might fix) #3589 (I'm not sure if this is the same issue or not, it looks to be a bit subtler)

No visual changes

Environment: Fixed against main.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

How should this be tested?

I looked for unit/integration tests but couldn't find any, so I might be missing some. To repro I created a new google calendar, accessed via CalDav. I created a single weekly recurring event in the calendar, and checked availability for each day in the month view for an event type in Cal.com. I could see that after my fix, the time slot with a clash was correctly not showing up in all 4 weeks, rather than just the first week.

Checklist

I did all those things, I really think this is a pretty simple fix. Feel free to disagree though! 😊

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Name	Status	Preview	Updated
cal	❌ Failed (Inspect)		Aug 12, 2022 at 9:28PM (UTC)

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[willgittoes]

Thanks so much for accepting this! It was really easy to get the dev environment set up and working ☺