Fix mask rendering in Liquify

Agata Cackorequested to merge
tymond/krita:tiar/fix_liquify_mask_after_speed_improvements into master

I fixed the Liquify mask rendering by making the rendering worse and less neat, just like it was before. It's also a bit slower now.

Test Plan

  1. Make a transform mask test file on Krita 5.2.x, or check file from this bug report: https://bugs.kde.org/show_bug.cgi?id=512577
  2. Render it in Krita 5.2.
  3. Open it in this MR and make sure no pixel is different.

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?

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