Fix picture selector behavior

[ovinix]

What is this pull request for?

Fixes few issues:

1. Checkbox becomes invisible after selecting/unselecting an image
2. Selection toolbar is not visible when one or multiple images are selected

Updates pictures select all behavior:

• when no pictures selected then all pictures selected
• when one/many pictures selected then all pictures selected instead of toggling of picture selection state

Closes #2960

Screenshots

Checklist

• I have followed Pull Request guidelines
• I have added a detailed description into each commit message
• I have added tests to cover this change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.00%. Comparing base (208b043) to head (42374ed).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2964   +/-   ##
=======================================
  Coverage   96.00%   96.00%           
=======================================
  Files         232      232           
  Lines        6282     6282           
=======================================
  Hits         6031     6031           
  Misses        251      251           

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[tvdeyen]

Amazing. Thank you 🙏🏻