atlas_generate_cliddb: Remove dummy_clid.db file
With athena!30367 (merged), the genCLIDDB executable no longer requires
a mandatory (empty) input clid.db file.
GitLab jobs artifacts no longer stored forever as of Monday, November 4th 08:30h. Further information under https://cern.ch/otg0152576
With athena!30367 (merged), the genCLIDDB executable no longer requires
a mandatory (empty) input clid.db file.