Bug 32010: Make sure the alert will be displayed after the ajax call

Bug 32010: Make sure the alert will be displayed after the ajax call

There is a missing wait_for_ajax call at after we click but wait_for_ajax
is waiting for the return of success, and the alert is there.

22:01:57 koha_1       | STRACE:	/usr/share/perl5/Try/Tiny.pm:123 in Selenium::Remote::Driver::catch {...}
22:01:57 koha_1       | 	/usr/share/perl5/Selenium/Remote/Driver.pm:361 in Try::Tiny::try
22:01:57 koha_1       | 	(eval 541):1 in Selenium::Remote::Driver::__ANON__
22:01:57 koha_1       | 	(eval 543):2 in Selenium::Remote::Driver::__ANON__
22:01:57 koha_1       | 	/usr/share/perl5/Selenium/Remote/Driver.pm:654 in Selenium::Remote::Driver::_execute_command
22:01:57 koha_1       | 	t/db_dependent/selenium/authentication_2fa.t:282 in Selenium::Remote::Driver::get_alert_text
22:01:57 koha_1       | 	/usr/share/perl/5.32/Test/Builder.pm:334 in main::__ANON__
22:01:57 koha_1       | 	/usr/share/perl/5.32/Test/Builder.pm:334 in (eval)
22:01:57 koha_1       | 	/usr/share/perl/5.32/Test/More.pm:809 in Test::Builder::subtest
22:01:57 koha_1       | 	t/db_dependent/selenium/authentication_2fa.t:291 in Test::More::subtest
22:01:57 koha_1       |
22:01:57 koha_1       |     # Looks like you planned 7 tests but ran 4.
22:01:57 koha_1       |
22:01:57 koha_1       | #   Failed test 'Enforce 2FA setup on first login'
22:01:57 koha_1       | #   at t/db_dependent/selenium/authentication_2fa.t line 291.
22:01:57 koha_1       | Error while executing command: no such alert at /usr/share/perl5/Selenium/Remote/Driver.pm line 411.
22:01:57 koha_1       |  at /usr/share/perl5/Selenium/Remote/Driver.pm line 356.
22:01:57 koha_1       | # Looks like your test exited with 255 just after 4.
22:01:57 koha_1       | [20:59:37] t/db_dependent/selenium/authentication_2fa.t

Test plan:
Confirm that the test pass (execute it in a loop, hundreds of times)
Confirm that the behaviour of 2FA "enforced" (see bug 30588) is still
working as expected.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>