Fix #117798: "Nothing to Bake" when pose object is not selected

Use `context.pose_object` when baking a pose, on on top of the objects
in `context.selected_editable_objects`. When in pose mode, it's expected
that the pose of the active will be baked, regardless of whether the
pose object is selected itself.

@@ -292,0 +293,4 @@
+                if pose_object and pose_object not in objects:
+                    # The active object might not be selected, but it is the one in pose mode,
+                    # and thus it can be assumed that this is the pose that needs baking.
+                    objects.append(context.pose_object)