component/tesseract: Workaround for slaprunner paths with double slashs

This is basically the same problem as in 1b291415
(component/ghostscript: Workaround for slaprunner paths with double
slashs, 2021-06-02)
Status Job ID Name Coverage
  External
running ERP5.UnitTest-TesseractDoubleSlash

30911:42:15

running SlapOS.Eggs.UnitTest-Master.Python2

30911:40:55

running SlapOS.Eggs.UnitTest-Master.Python3

30911:41:06

running SlapOS.SlapRunner.ResilienceTest-Master

30911:41:02

running SlapOS.SlapRunner.ResilienceTest-Master.ERP5

30911:41:52