Fix sporadic errors AdminQueueTemplates.t

[bschmalhofer]

The failure in AdminQueueTemplates.t seems to be sporadic.

Running prove -v -I . -I Kernel/cpan-lib/ scripts/test/Selenium/Agent/Admin/AdminQueueTemplates.t reported no errors. The test runs in GitLab also work fine.

This might also occur in older releases. See #2286.

Test Summary Report

/opt/otobo/scripts/test/Compile.t (Wstat: 0 Tests: 1762 Failed: 0)
TODO passed: 714, 844
/opt/otobo/scripts/test/Selenium/Agent/Admin/AdminQueueTemplates.t (Wstat: 512 (exited 2) Tests: 38 Failed: 2)
Failed tests: 37-38
Non-zero exit status: 2
/opt/otobo/scripts/test/Selenium/TestingMethods.t (Wstat: 0 Tests: 36 Failed: 0)
TODO passed: 21, 24, 28
Files=975, Tests=81967, 4137 wallclock secs (19.73 usr 2.67 sys + 1024.47 cusr 164.78 csys = 1211.65 CPU)
Result: FAIL
ran tests for product OTOBO 11.1.x on host 54052b3a1669 .

Originally posted by @bschmalhofer in #4148

[bschmalhofer]

The failure is still there in latest local run of the test suite under rel-11_1.