Benchmark the largest valid Sapling transaction in validatelargetx

11130 inputs results in a transaction between 1992301 and 2003431 bytes.

src/wallet/rpcwallet.cpp

@@ -2723,7 +2723,7 @@ UniValue zc_benchmark(const UniValue& params, bool fHelp)
             sample_times.push_back(benchmark_verify_equihash());
         } else if (benchmarktype == "validatelargetx") {
             // Number of inputs in the spending transaction that we will simulate
-            int nInputs = 555;
+            int nInputs = 11130;
             if (params.size() >= 3) {
                 nInputs = params[2].get_int();
             }