erp5_officejs_drone_simulator_test: fix test flight page

See merge request !1805
7 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed ERP5.CodingStyleTest-Master

00:36:05

passed ERP5.PerformanceTest-Master

00:27:23

failed ERP5.UnitTest-Master

01:37:59

failed ERP5.UnitTest-Zope2

02:04:39

passed SlapOS.Eggs.UnitTest-Master.Python2

00:17:36

passed SlapOS.Eggs.UnitTest-Master.Python3

00:18:05

passed Wendelin.UnitTest-Master

00:27:12