refactor: Call type-solver earlier in decodescript

Also, remove std::string type.

src/rpc/rawtransaction.cpp

@@ -576,18 +576,16 @@ static RPCHelpMan decodescript()
     }
     ScriptPubKeyToUniv(script, r, /* include_hex */ false);
 
-    UniValue type;
-    type = find_value(r, "type");
+    std::vector<std::vector<unsigned char>> solutions_data;
+    const TxoutType which_type{Solver(script, solutions_data)};
 
-    if (type.isStr() && type.get_str() != "scripthash") {
+    if (which_type != TxoutType::SCRIPTHASH) {
         // P2SH cannot be wrapped in a P2SH. If this script is already a P2SH,
         // don't return the address for a P2SH of the P2SH.
         r.pushKV("p2sh", EncodeDestination(ScriptHash(script)));
         // P2SH and witness programs cannot be wrapped in P2WSH, if this script
         // is a witness program, don't return addresses for a segwit programs.
-        if (type.get_str() == "pubkey" || type.get_str() == "pubkeyhash" || type.get_str() == "multisig" || type.get_str() == "nonstandard") {
-            std::vector<std::vector<unsigned char>> solutions_data;
-            TxoutType which_type = Solver(script, solutions_data);
+        if (which_type == TxoutType::PUBKEY || which_type == TxoutType::PUBKEYHASH || which_type == TxoutType::MULTISIG || which_type == TxoutType::NONSTANDARD) {
             // Uncompressed pubkeys cannot be used with segwit checksigs.
             // If the script contains an uncompressed pubkey, skip encoding of a segwit program.
             if ((which_type == TxoutType::PUBKEY) || (which_type == TxoutType::MULTISIG)) {