Move: use $from for object in Move::externally (#1531)

* Move: use `$from` for object in `Move::externally`

* Add changelog

Author: mattwiebe

.github/changelog/1531-from-description

@@ -0,0 +1,4 @@
+Significance: minor
+Type: fixed
+
+Use the $from account for the object in Move activity for external Moves

includes/class-move.php

@@ -78,7 +78,7 @@ public static function externally( $from, $to ) {
 		$activity->set_type( 'Move' );
 		$activity->set_actor( $user->get_id() );
 		$activity->set_origin( $user->get_id() );
-		$activity->set_object( $target_actor->get_id() );
+		$activity->set_object( $user->get_id() );
 		$activity->set_target( $target_actor->get_id() );
 
 		// Add to outbox.