store shape after Kohya HRFix is applied, use it in SAG instead of trying to calculate. AFAICT, calculation can never be 100% correct due to rounding. Original method is tried first.
additional stored shape can be used by other extensions, e.g. Forge Couple, to enable compatibility with Kohya HRFix
* SAG updates
* restore settings from infotext
* bypass if model is Flux (would error during generation)
* bypass if CFG == 1 (would error during generation)
* add control of blur mask threshold (previously hardcoded)
* change to InputAccordion
* forge_sag.py: update title