Coverity issues since 04.03.2022 [ PART 3 !!! ] - I know it's probably difficult to tell them apart ;)

• commit 1 - Initializing members of classes in /libs/psd/
  • CID 248742
  • CID 36428
  • CID 36293
• commit 2 - Initializing members in classes in /libs/ui/canvas/
  • CID 248665
  • CID 36091
  • CID 36391
  • CID 248589
  • CID 36043
  • CID 248700
  • CID 248726
• commit 3 - Initializing members in classes in /libs/ui/dialogs/
  • CID 248701
  • CID 248729
  • CID 304980
  • CID 305018
• commit 4 - CID 34952, CID 34953
• commit 5 - CID 248612, CID 329452
• commit 6 - CID 329436
• commit 7 - CID 350090
• commit 8 - CID 350121
• commit 9 - CID 34804

Total: 22 Coverity issues

Test Plan

• unit tests before and after
• reading code if it makes sense

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.