Set screen bounds for active window grab when compositor is disabled
Summary:
It failed to capture the window area when the window was outside of the screen and showed a null image to the user when compositor was not enabled.
Now it only captures the area that is on the screen.
BUG: 390652
Reviewers: Spectacle, rkflx, ngraham, broulik
Reviewed By: Spectacle, rkflx, ngraham
Subscribers: davidedmundson, broulik, ngraham
Tags: Spectacle
Differential Revision: https://phabricator.kde.org/D10672