TT#46791 Add timeout 1 second for controller_billing.t

It will give Ajax enough time to load 'Edit' button,
otherwise we have some mystery which randomly happens
when Jenkins tests VMs on Google Cloud:

> # Edit Wednesday
> ok 26
> # Move mouse over 'Weekdays' row to make 'Edit' button available
> # Find 'Edit' button for element 'Wednesday'
> ok 27
> # Click 'Edit' button for element 'Wednesday'
> Can't use string ("element not interactable") as a HASH ref while "strict refs" in use at /home/selenium/Selenium-Remote-Driver/lib/Selenium/Remote/Driver.pm line 684.
>  at /home/selenium/Selenium-Remote-Driver/lib/Selenium/Remote/Driver.pm line 655.
> # Tests were run but no plan was declared and done_testing() was not seen.
> # Looks like your test exited with 255 just after 27.

Locally it is not reproducible, also VM on Proxmox has
no such issues as well. I spend too much time here trying
to find the root of the issue, maybe Firefox version
we are currently using has some issues here. Give up, sleep 1.

Change-Id: I168270f6f6d25d8bdccfe6a40b2bc63aa0c5068e
(cherry picked from commit 72834f126d)

t/selenium/controller_billing.t

@@ -135,6 +135,7 @@ $d->move_action(element => ($d->find_element('//h3[contains(text(),"Weekdays")]'
 sleep 2 if ($d->browser_name_in("htmlunit"));
 $d->move_action(element => $row);
 diag("Find 'Edit' button for element 'Wednesday'");
+sleep 1; # give ajax time to load
 my $btn = $d->find_element('//table//td[contains(text(),"Wednesday")]/..//a[text()[contains(.,"Edit")]]');
 ok($btn);
 diag("Click 'Edit' button for element 'Wednesday'");