screenshot times are off

[yshavit]

When we auto-generate the screenshots in the GH action, we set the system time zone such that it's 6 or 7pm (8a8daa5), but we don't adjust the mocked clock's time zone to compensate, nor do we adjust the mock event's times. We should. Specifically:

• We should use the system time zone for this test, not the usual mocked one
• To calculate the event times, we should just use Calendar's date(bySettingHour: ...) to the hours and minutes of the events.