Fix: Set state of duplicated task to nothing

This creates an open duplicate and prevents the previous issue
where the state was set to `Done` but the close trigger would not react
and set a closed date.

Author: yeldiRium

tasklite-core/source/Lib.hs

@@ -1365,6 +1365,7 @@ duplicateTasks conf connection ids = do
             , Task.awake_utc = val_ Nothing
             , Task.closed_utc = val_ Nothing
             , Task.modified_utc = val_ modified_utc
+            , Task.state = val_ Nothing
             }
 
         -- Duplicate tags