Pretty_progress is called from sample within stablediffusion.cpp at line 707
It is called with a value of step=0

This shows that the sampling has been started and step 1 is running.. with this line here that does not happen.

Remove newlines in parameters metadata and make it a consistent format.

Allows generation parameters to be shown in whole using imagemagick for example:
identify -verbose output.png | grep -i "parameters"

Makes it easier to script as all entries become format Label: Value separated by commas