[hdf5scan] fix scan path when loaded from dictionnary

3 jobs for more_fix_hdf5_creation in 2 minutes and 5 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test Library
passed test:python3.5-stretch-pyqt5 #126978

00:01:13

passed test:python3.7_stretch_pyqt5 #126979

00:01:10

 
  Test Notbooks
passed test:test-tomoscan-tutorials #126980

00:00:51