fix add type attribute to prevent form submission

[silverlila]

Description

I discovered an issue while using the image plugin in the editor. The plugin renders a placeholder button, which I need to click to open a popover. However, clicking this button inadvertently triggers form submissions because it lacks the type="button" attribute.

Fixes # (issue)

Type of change

Please tick the relevant option.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist:

• [x] I have performed a self-review of my own code
• [ ] I have commented on my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have checked my code and corrected any misspellings

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