Remove redundant redeclaration of rescanblockchain(...) in same scope

Author: practicalswift

src/wallet/rpcwallet.cpp

@@ -4761,7 +4761,6 @@ extern UniValue importwallet(const JSONRPCRequest& request);
 extern UniValue importprunedfunds(const JSONRPCRequest& request);
 extern UniValue removeprunedfunds(const JSONRPCRequest& request);
 extern UniValue importmulti(const JSONRPCRequest& request);
-extern UniValue rescanblockchain(const JSONRPCRequest& request);
 
 static const CRPCCommand commands[] =
 { //  category              name                                actor (function)                argNames