[ios] Make turnstile send guard based off of calendar day (#5180)

This improves the turnstile send time guard so that instead of guarding
against sending a turnstile event once per 24 hours it guards using
a calendar day. This means that, all else being equal, a turnstile
can be sent once per day in the same session assuming there is a map
load event in that session. A turnstile will always be sent for a map
load at the start of a session.

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