R1:659e13fa6d0e

Fix UX regression in Dashboard Tabs Panel

Summary:
Before this change, it seems that the Dashboard Tabs Panel could be empty
as default. This was the regression:

cbc0e661544a31290099ab3d88481bb8d4a3003c

The variable $is_selected was defined inside a foreach loop, but that loop
was terminated when it was then read again. This redefines that variable in
the right scope.

| Before | After |
|-----------|-----------|
| {F312797} | {F312798} |

Closes T15474

Test Plan: - see that now you have…