fuzz: Simplify CTxDestination fuzzing in the script target

The WitnessUnknown operators == and < are already called indirectly by
the corresponding CTxDestination operators.

src/test/fuzz/script.cpp

@@ -184,25 +184,12 @@ FUZZ_TARGET_INIT(script, initialize_script)
     }
 
     {
-        WitnessUnknown witness_unknown_1{};
-        witness_unknown_1.version = fuzzed_data_provider.ConsumeIntegral<uint32_t>();
-        const std::vector<uint8_t> witness_unknown_program_1 = fuzzed_data_provider.ConsumeBytes<uint8_t>(40);
-        witness_unknown_1.length = witness_unknown_program_1.size();
-        std::copy(witness_unknown_program_1.begin(), witness_unknown_program_1.end(), witness_unknown_1.program);
-
-        WitnessUnknown witness_unknown_2{};
-        witness_unknown_2.version = fuzzed_data_provider.ConsumeIntegral<uint32_t>();
-        const std::vector<uint8_t> witness_unknown_program_2 = fuzzed_data_provider.ConsumeBytes<uint8_t>(40);
-        witness_unknown_2.length = witness_unknown_program_2.size();
-        std::copy(witness_unknown_program_2.begin(), witness_unknown_program_2.end(), witness_unknown_2.program);
-
-        (void)(witness_unknown_1 == witness_unknown_2);
-        (void)(witness_unknown_1 < witness_unknown_2);
-    }
-
-    {
-        const CTxDestination tx_destination_1 = ConsumeTxDestination(fuzzed_data_provider);
+        const CTxDestination tx_destination_1{
+            fuzzed_data_provider.ConsumeBool() ?
+                DecodeDestination(fuzzed_data_provider.ConsumeRandomLengthString()) :
+                ConsumeTxDestination(fuzzed_data_provider)};
         const CTxDestination tx_destination_2 = ConsumeTxDestination(fuzzed_data_provider);
+
         (void)(tx_destination_1 == tx_destination_2);
         (void)(tx_destination_1 < tx_destination_2);
     }