[GUI Plugin] Modify ePub

[foosion]

Originally Posted by theducks

It is a Calibre Tweak
ID: save_original_format

When calibre does a conversion from the same format to the same format, for example, from EPUB to EPUB, the original file is saved, so that in case the conversion is poor, you can tweak the settings and run it again. By setting this to False you can prevent calibre from saving the original file. Similarly, by setting save_original_format_when_polishing to False you can prevent calibre from saving the original file when polishing.

Setting both to False worked.