fix #8288 Move search button of web search elsewhere

[Yancy10-1]

Move search button of web search elsewhere

fixes #8288

• Change in CHANGELOG.md described in a way that is understandable for the average user (if applicable)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

Screenshots:

[calixtus]

Thanks for your pull request and your work. @ThiloteE already mentioned a good rationale in the corresponding issue i can only agree too. However, we will nevertheless discuss your proposal in the next devall and make a final decision on this PR.

[koppor]

Thank you for the first time contribution.

JavaFX is a long and rocky roard. The proposed button is NOT aligned with the search field:

In the DevCall, we decided to keep the UI as is.

For further pull requests, please setup your JabRef environment as described at https://devdocs.jabref.org/getting-into-the-code/guidelines-for-setting-up-a-local-workspace#using-jabrefs-code-style.