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

25099:06:27

running SlapOS.Eggs.UnitTest-Master.Python2

25099:05:08

running SlapOS.Eggs.UnitTest-Master.Python3

25099:05:19

running SlapOS.SlapRunner.ResilienceTest-Master

25099:05:15

running SlapOS.SlapRunner.ResilienceTest-Master.ERP5

25099:06:05