Campaign editor scrolls to top of page when insert-link dialog is shown

[toontoet]

Version:

• listmonk: v2.5.1
• OS: Docker
• Browser: Firefox, Chrome

Description of the bug and steps to reproduce:
When editing a very long text in the campaign editor, so that the editor is enlarged and the page is scrolling, add a link at the bottom of the text. When the 'Insert Link' dialog is shown, the whole page scrolls to the top position. When you're done inserting the link you have to scroll back to the bottom of the page to continue where you left of.