Correctly detect a daily Cron and show the Daily tab

[ryrobbo]

Issue:
Creating a daily Cron then making it the default expression pre-selects the "Advanced" tab instead of the "Daily" tab. This is an issue when persisting an expression then revisiting it to change/review it.

Reproducible steps:
On the Daily tab, create a Cron that will run every 1 day(s) at any specific time. Take the resulting expression and set it as the component's default expression.

Notes:
It seems the code that normalises the expression converts;

30 6 1/1 * * => 30 6 * * *

The changes in this PR handle this situation and shows the "Default" tab.