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Fix [#29461] Selection-to-Cursor works strange with bones with TrackTo constraint.

In fact, the problem was present with any kind of constraint�?�

We need the cursor coordinates in the rest bone space (aka armature space), i.e with all "manual" and "procedural" (constraints, ...) pose transforms cleared (as said in armature_mat_pose_to_bone:

/* Remove the pchan's transforms from it's pose_mat.
* This should leave behind the effects of restpose +
* parenting + constraints
*/

, only "manual" transforms are "cleared" by armature_loc_pose_to_bone...).