Fix warp transform preview not showing until first adjustment

Ivan Valenzuelarequested to merge
iavalen/krita:bugfix/warp-tool-image-dissapears into master

Fix for these two bugs:

  1. 519127 – Warp tool makes instant preview glitch and disappear. Other transforms are fine.
  2. 518071 – Warp transform preview doesn't show

The image being transformed disappears when selecting the warp tool because queued pixel copy operations were never flushed. Added missing finalize() call to ensure image is initialized.

Recreate bug by creating new document, creating stroke, press ctrl+t for transform tool, select warp and image disappears.

BUG:519127,518071

Edited by Ivan Valenzuela

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