refactor: Block unsafe fs::path std::string conversion calls

There is no change in behavior. This just helps prepare for the
transition from boost::filesystem to std::filesystem by avoiding calls
to methods which will be unsafe after the transaction to std::filesystem
to due lack of a boost::filesystem::path::imbue equivalent and inability
to set a predictable locale.

Co-authored-by: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
Co-authored-by: Kiminuo <kiminuo@protonmail.com>
Co-authored-by: MarcoFalke <falke.marco@gmail.com>

src/wallet/wallettool.cpp

@@ -125,7 +125,7 @@ bool ExecuteWalletToolFunc(const ArgsManager& args, const std::string& command)
         return false;
     }
     const std::string name = args.GetArg("-wallet", "");
-    const fs::path path = fsbridge::AbsPathJoin(GetWalletDir(), name);
+    const fs::path path = fsbridge::AbsPathJoin(GetWalletDir(), fs::PathFromString(name));
 
     if (command == "create") {
         DatabaseOptions options;