fixup! test: follow recent ImageMagick spec.

7 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed ERP5.CodingStyleTest-Master

00:44:37

failed ERP5.PerformanceTest-Master

00:29:08

failed ERP5.UnitTest-Master

01:47:52

failed ERP5.UnitTest-Zope2

02:07:00

passed SlapOS.Eggs.UnitTest-Master.Python2

00:13:28

passed SlapOS.Eggs.UnitTest-Master.Python3

00:19:54

passed Wendelin.UnitTest-Master

00:26:46