Remove invalid data from satellites.dat

[miladfarca]

An invalid data was added by d839bfa to satellites.dat which causes the application to exit immediately with this log:

$ cat ~/.config/Gpredict/logs/gpredict.log
sat_log_init: Session started
sat_cfg_load: Error reading config file (No such file or directory)
sat_cfg_load: Using built-in defaults
create_sat_files: Failed to load data from /usr/local/share/gpredict/data/satdata/satellites.dat (Invalid group name: )
User config check failed (code 32). This is fatal.
A possible solution would be to remove the .config/Gpredict data dir in your home directory

[miladfarca]

/cc @csete