COCOA - COVID-19 Contact App

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-Improved notification function that did not work normally even if there was close contact with a positive person.
-Improved the case in which the application seems to be reset (usage start date is reset, the terms of use screen is displayed again, etc) on some devices.
-Fixed the issue of users who had contact (within 1 meter for 15 minutes or more ) with a positive person, was notified of the proximity to a person who did not meet the condition.