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

23994:04:34

running SlapOS.Eggs.UnitTest-Master.Python2

23994:03:14

running SlapOS.Eggs.UnitTest-Master.Python3

23994:03:25

running SlapOS.SlapRunner.ResilienceTest-Master

23994:03:21

running SlapOS.SlapRunner.ResilienceTest-Master.ERP5

23994:04:11