[PPLX] Fixed bug in pplx::task_options(cancellation_token, task_continuation_context) constructor#1824

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eugenegff wants to merge 1 commit intomicrosoft:masterfrom

eugenegff:fix_task_option_ctor

Commits on Oct 18, 2021

Fixed task_options(cancellation_token, task_continuation_context) constructor - should set _M_HasCancellationToken. Bug was introduced in PPL in VS2013 and fixed in VS2015 but survives in PPLX
eugenegff
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