Added the flag OFN_NOCHANGEDIR when opening a file (prevents changing the working directory).

This prevents the config file from being exported to the ROM folder, resulting in config saving problems.

desmume/src/windows/main.cpp

@@ -1799,6 +1799,7 @@ LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM
                             ofn.lpstrFile =  filename;
                             ofn.nMaxFile = MAX_PATH;
                             ofn.lpstrDefExt = "nds";
+							ofn.Flags = OFN_NOCHANGEDIR;
                             
                             if(!GetOpenFileName(&ofn))
                             {