Avoid setting the CONN_STR in queues unless it is meant to be set #13025
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Since the move to common leveldb and common redis the disk queue code (#12385)
will check the connection string before defaulting to the DATADIR.
Therefore we should ensure that the connection string is kept empty
unless it is actually set.
Fix #13023
Signed-off-by: Andrew Thornton art27@cantab.net