IFC: Remove redundand check (#6006)

- closes https://github.com/assimp/assimp/issues/5798

code/AssetLib/IFC/IFCLoader.cpp

@@ -2,7 +2,7 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------
 
-Copyright (c) 2006-2024, assimp team
+Copyright (c) 2006-2025, assimp team
 
 All rights reserved.