Change position of label in SaveOptions.ui

Summary:
Changed position of message to change image quality.
I think the label is better read before the compression quality bar.
I used Qt Designer for this.

Before:
{F8254672}

After:
{F8254673}

Reviewers: #spectacle, #vdg, ngraham, davidre

Reviewed By: #spectacle, #vdg, ngraham, davidre

Subscribers: davidre, ngraham

Tags: #spectacle

Differential Revision: https://phabricator.kde.org/D29113