Add shortcut for Red Eye Reduction tool

Summary:
Crop and Resize already have shortcuts involving
⇧. Let's add a similar shortcut for the remaining tool,
i.e. Red Eye Reduction.

Test Plan:
⇧+E shortcut works in View mode, and appears in the
Edit menu. No shortcut conflicts.

Reviewers: Gwenview, muhlenpfordt, ngraham

Reviewed By: Gwenview, muhlenpfordt, ngraham

Subscribers: muhlenpfordt

Differential Revision: https://phabricator.kde.org/D14475