Fix forwarding of return type from execution::then callable
#994
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The result of the callable in
then(andcuda::then_on_host) was previously taken by universal reference (auto&&) but then moved into the successor receiver. This would be wrong when the return type of the callable is a reference, and fail to compile if the successor receiver also expects a reference. This moves the call of the callable to simply directly pass the result intoset_valueinstead of going via an intermediate local variable. This also adds a regression test forthen.