libtaskmanager: simplify task movement and consider grouped tasks when not separating launchers
Test: - Disable Keep launchers separate - Open many Konsole windows, and pin Konsole - Open one Dolphin window, and pin Dolphin - Move Konsole group to the right of Dolphin - Move Konsole group to the left of Dolphin - Use qDebug to find the position of Konsole launcher in `sortedPreFilterRows`
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