Styling issue with checkbox on image style effects overview

Problem/Motivation

The checkbox for the "Copy effect to all derivative image styles" element is positioned nowhere near the label.

Steps to reproduce

1. Install the module
2. Add a default image style
3. See the bottom bar, when applying an effect

Proposed resolution

Correct the styling with an additional styling.

Remaining tasks

None

User interface changes

Add styling for checkbox on image effect overview (image style detail)

API changes

None

Data model changes

None