[FAB-14770] remove dead To field from shim.Handler
[FAB-14770] remove dead To field from shim.Handler

Change-Id: Id90fad925aa45d8e008c2f6d5fe613688cd1f148
Signed-off-by: Matthew Sykes <89c6e4c9c1046731a9c37abefc223a83de36a5d9@us.ibm.com>

binhn/fabric,stemlending/fabric,muralisrini/fabric,manish-sethi/fabric-sidedb,jimthematrix/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,binhn/fabric,manish-sethi/fabric-sidedb,muralisrini/fabric,jimthematrix/fabric,stemlending/fabric,muralisrini/fabric,hyperledger/fabric,manish-sethi/fabric,manish-sethi/fabric,hyperledger/fabric,stemlending/fabric,manish-sethi/fabric-sidedb,binhn/fabric,manish-sethi/fabric-sidedb,stemlending/fabric