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

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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