Daily task human readable schedule returns all the days of the weeks since 2.7.0

[alexandre-paroissien]

Hello team, when upgrading from 2.6.0 to 2.7.0 the human readable schedule was changed:

For example:

Unit testing periodic_task.crontab.human_readable (where periodic_task is a PeriodicTask instance)

Before (2.6.0): "At 01:00 AM UTC"
After (2.7.0): "At 01:00 AM, only on Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday UTC"

Before (2.6.0): "At 06:05 PM, on day 28 of the month, only in February UTC"
After (2.7.0): "At 06:05 PM, on day 28 of the month, only on Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday, only in February UTC"

This seems too verbose and redundant, if the task is daily, there's no need to list all the days of the week, this edge case could be corrected to revert back to the 2.6.0 message

It might be coming from this change:
#745