Copy Attributes: Use new constraints.copy() which works better with Armature constraints

Currently when copying Armature constraints with the Copy Attributes addon, it does not copy the targets. rB64a584b38a73d4745e introduced a new constraints.copy() function to the Python API which handles this correctly and elegantly with just one line of code.

Reviewed By: sybren

Differential Revision: https://developer.blender.org/D8422

space_view3d_copy_attributes.py

@@ -272,11 +272,7 @@ class CopySelectedPoseConstraints(Operator):
         for bone in selected:
             for index, flag in enumerate(self.selection):
                 if flag:
-                    old_constraint = active.constraints[index]
-                    new_constraint = bone.constraints.new(
-                        active.constraints[index].type
-                    )
-                    generic_copy(old_constraint, new_constraint)
+                    bone.constraints.copy(active.constraints[index])
         return {'FINISHED'}