Fix failing unit test

Co-authored-by: Goran Rojovic <goran-ethernal@users.noreply.github.com>

Author: Stefan-Ethernal

rpc/rpc_test.go

@@ -575,7 +575,7 @@ func TestInteropEndpointsSendTx(t *testing.T) {
 			isSignerValid:     true,
 			canGetBatch:       true,
 			isBatchValid:      false,
-			expectedError:     "Mismatch detected",
+			expectedError:     "mismatch in state roots detected",
 		})
 	})