By default there wouldn’t be an ini entry, only if you elect to delay the avast services until other system services have loaded.
So it is an on or off option 0 or 1, LateServiceStart=1 being ‘delay loading of avast! services until after other system services.’

There would only be a LateServiceStart=0 in the ini file if you change it back in the program settings, to the default of unchecked.