fix: failed to load python when startup as subprocess.

[thegoodtgg]

According the doc about "LoadLibrary" and "SetDllDirectory", when PyStand not run as sub-process, dll search path not including "runtime" directory, PyStand failed to load python3.dll.
Using SetDllDirectory instead of "SetCurrentDirectory" would fix the problem.

[thegoodtgg]

Although, I haven't found any apparent evidences from ms doc. I guess it's related to the way call "CreateProcess" to create PyStand process.

I only found this from LoadLibrary - Remarks

The first directory searched is the directory containing the image file used to create the calling process (for more information, see the CreateProcess function). Doing this allows private dynamic-link library (DLL) files associated with a process to be found without adding the process's installed directory to the PATH environment variable.

However in our situation, python3.dll is loaded from working directory not the application directory.

[skywind3000]

thanks, but PyStand is using tabs for indentation, while you are using spaces, please keep consistency.