UI fixes for picture css class display

[tvdeyen]

What is this pull request for?

The css_class is shown as overlay on the picture ingredient editor. Since the toolbar has raised the height we need to adopt the position

Checklist

• [x] I have followed Pull Request guidelines
• [x] I have added a detailed description into each commit message

[codecov[bot]]

Codecov Report

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

Project coverage is 95.86%. Comparing base (5f1790c) to head (7cf54db).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2844 +/- ## ======================================= Coverage 95.86% 95.86% ======================================= Files 229 229 Lines 6208 6208 ======================================= Hits 5951 5951 Misses 257 257 ```

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[alchemycms-bot]

💚 All backports created successfully

Status	Branch	Result
✅	7.1-stable

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