Update Convert extender (#4409)

* Update Convert extender

* Update copyright year

model-optimizer/mo/utils/ir_reader/extenders/convert_extender.py

@@ -1,5 +1,5 @@
 """
- Copyright (C) 2018-2020 Intel Corporation
+ Copyright (C) 2018-2021 Intel Corporation
 
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
@@ -26,7 +26,6 @@ class Convert_extender(Extender):
     def extend(op: Node):
         op['dst_type'] = destination_type_to_np_data_type(op.destination_type)
         # CompressQuantizeWeights generates IR with constant sub-graph, that should not be ConstFolded:
-        #   Const(u8) -> Convert(to fp) -> FakeQuantize
+        #   Const(u8) -> Convert(to fp) -> (some eltwise operations) -> FakeQuantize
         if op.in_node().in_node().soft_get('type') == 'Const':
-            if op.out_node().out_node().soft_get('type') == 'FakeQuantize':
-                op['stop_value_propagation'] = True
+            op['stop_value_propagation'] = True