Run_me.py doesn’t work for Spark

[brett8883]

The run_me.py doesn’t account for Spark’s cfg.sig having “a” designation in wm100a.cfg.sig .

It throws an error when running image.py. If one renamed wm100a.cfg.sig to wm100.cfg.sig the script will continue but then patch_sequence_for_dummy_dummy verify won’t repack the firmware image at the end due to the cfg.sig not being named properly