libtaskmanager: Fix dragging launcher icon when separateLaunchers is false

Fushan Wenrequested to merge
work/fuf/fix-dragging-launcher-icon into master

When separateLaunchers is false and there are two opened pinned tasks and one launcher icon, dragging the launcher icon to a position between the two pinned tasks always fails for the first time. This is fixed by using moveRows instead of resetModel.

BUG: 444816 FIXED-IN: 5.26

Before After (KDevelop is unpinned)
before after
Edited by Fushan Wen

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