Add support for dimming the colors when losing focus

Summary:
pretty vital (at least for me) if one doesn't have compositing.

we can't use the normal QPalette::Inactive because of color schemes,
but I made the new scrollbar color code follow the same dimming colors.

Test Plan:
tested with and without compositing, with and without scrollbar,
and dark and light color schemes.

Reviewers: hindenburg, #konsole

Reviewed By: hindenburg, #konsole

Subscribers: anthonyfieroni, konsole-devel, #konsole

Tags: #konsole

Differential Revision: https://phabricator.kde.org/D16198

src/ViewManager.cpp

@@ -811,6 +811,7 @@ void ViewManager::applyProfileToView(TerminalDisplay *view, const Profile::Ptr p
 
     // show hint about terminal size after resizing
     view->setShowTerminalSizeHint(profile->showTerminalSizeHint());
+    view->setDimWhenInactive(profile->dimWhenInactive());
 
     // terminal features
     view->setBlinkingCursorEnabled(profile->blinkingCursorEnabled());