Fix notification reply window activation and focus
Ensures the reply window is raised using Qt::WindowActive state by KStartupInfo::setNewStartupId, so KWin honors the activation request. This
properly raises the window reliably (including from plasmoid, which
didn't work at all before) and focuses the reply textbox.
Doesn't use hacks like always-on-top.
Edited by Bharadwaj Raju