Prediction icons in Taskbar were updating when dragging icon in the same place

When dragging an icon in the Taskbar and dropping
it in the same spot it triggers new predictions when
it shouldn't. Basically, it was thinking that the icon
was moved outside of the taskbar which should trigger
new predictions. To fix it, it simply required to change
the order of the events, sending the UNPIN event before
the PIN event.

Bug: 202922907
Test: Have at least two prediction icons in the Taskbar, drag an app icon in the Taskbar, and drop it in the same place the prediction icon shouldn't change
Change-Id: I6079ff6eb69d7b1cb3c22bebc84511c0abd61cec