Fix positional argument passing to JLINKARM_BeginDownload

[NickeZ]

ctypes ignores the flags keyword argument, leaving the native function without its argument. Pass flags positionally so it receives zero.

fixes #269

[CLAassistant]

All committers have signed the CLA.

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[hkpeprah]

LGTM. I'll kick off CI. The CLA will have to be signed for us to accept changes though 🙏

[NickeZ]

LGTM. I'll kick off CI. The CLA will have to be signed for us to accept changes though 🙏

done

[hkpeprah]

Thanks for the fix, will include it in a patch release 👍