JPEG XL: Fix unable to set EPF value to -1 (encoder chooses) on export

Rasyuqa A Hrequested to merge
rasyuqaa/krita:rasyuqaa/jpegxl-fix-epf-value into master

This MR proposed to fix EPF (Edge Preserving Filter) slider on JPEG XL export advanced tab that cannot be set to -1 (encoder chooses, default) as per API docs, this bug makes the encoder always override the value instead of automatically chooses it by default.

Test Plan

  • Build Krita
  • Export an image document to JPEG XL image with EPF slider set to -1 in advanced tab
  • Verify if it's exported successfully

Formalities Checklist

  • I confirmed this builds.
  • I confirmed Krita ran and the relevant functions work.
  • I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!)
  • I made sure my commits build individually and have good descriptions as per KDE guidelines.
  • I made sure my code conforms to the standards set in the HACKING file.
  • I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.
  • Does the patch add a user-visible feature? If yes, is there a documentation MR ready for it at Krita Documentation Repository?

Reminder: the reviewer is responsible for merging the patch, this is to ensure at the least two people can build the patch. In case a patch breaks the build, both the author and the reviewer should be contacted to fix the build. If this is not possible, the commits shall be reverted, and a notification with the reasoning and any relevant logs shall be sent to the mailing list, kimageshop@kde.org.

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