Correcting dummy placeholder for changes in 6.4

Source commit: b539e897ae82171870900923a6abb9d4a1fd6be0

source/resource/Propagation.rc

@@ -95,5 +95,5 @@ BEGIN
   NEW_6_2_SYNC_HASH, "File hash can be used as criterion for synchronization"
   NEW_6_2_MOVE_DUPLICATE, "Improved behaviour when moving and duplicating remote files"
 
-  NEW_6_4, "TODO"
+  NEW_6_4_TBD, "TBD"
 END