[tasks] Move the Loop's sleep to be before exit conditions

This change makes it more so that `Loop.stop()` gracefully makes the
current iteration the final one, by waiting AND THEN returning.
The current implementation is closer to `cancel`, while also not.

I encountered this because I was trying to run a
`@tasks.loop(count=1)`, and inside it I print some text and change the
interval, and in an `after_loop`, I restart the loop.

Without this change, it immediately floods my console, due to
not waiting before executing `after_loop`.

0 files changed, 0 insertions, 0 deletions