Do not use CScript for tapleaf scripts until the tapleaf version is known

Prevents use of CScript methods until the tapleaf is known to be a tapscript.

src/script/descriptor.cpp

@@ -1643,7 +1643,7 @@ std::unique_ptr<DescriptorImpl> InferScript(const CScript& script, ParseScriptCo
                 for (const auto& [depth, script, leaf_ver] : *tree) {
                     std::unique_ptr<DescriptorImpl> subdesc;
                     if (leaf_ver == TAPROOT_LEAF_TAPSCRIPT) {
-                        subdesc = InferScript(script, ParseScriptContext::P2TR, provider);
+                        subdesc = InferScript(CScript(script.begin(), script.end()), ParseScriptContext::P2TR, provider);
                     }
                     if (!subdesc) {
                         ok = false;