Follow-up reminder emails have the wrong closing duration time

[jlumbroso]

The automated reminder email templates use:

<%= survey.surveySet.responseAcceptancePeriod %> day

in keep-asking/emails/surveyRequestSimple.ejs.

to explain to the respondent how many days they have left. This is correct when the survey window has just been opened, but as time elapses, that value should decrease ("3 days", "2 day", "1 day 3 hours", "2 hours").

This may in particular unintentionally frustrate well-intended students: They take the duration indicated in one of the follow-up emails at face value and are misled into trying to answer late.