io_uring: run the tctx task_work fallback directly

The fallback work drains the tctx queue only to redistribute the entries
into the per-ctx fallback lists, bouncing them through a second
(per-ctx) work item before they finally run. That made sense when the
producer side did the draining and could be in any context, but the
fallback work is a regular process context kworker: it can just run the
entries itself. Reuse the normal run loop - if run from the fallback
kernel thread, ts.cancel will get set, and the work terminated.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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