Make increase/decrease brush size actions work with Liquify

Carsten Hartenfelsrequested to merge
hartenfels/krita:feature/liquifybrushsize into master

Because the brush size change canvas input works for it as well, so it really only makes sense that the keyboard shortcuts would too.

See https://krita-artists.org/t/square-brackets-for-liquify-resizing/177847

Test Plan

  • Switch to the freehand tool. Actuate the incrase and decrease brush size actions (square bracket keys by default), observe that they work as before.
  • Put something on the canvas you can smoosh around with liquify.
  • Equip and activate the transform too.
  • Switch to liquify mode.
  • Actuate the increase and decrease brush size actions. Observe that they now change the size of the liquify "brush" instead of doing bugger all.

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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