apps: common: event_loop: Use `std::deque` instead of `std::list`

Deque has fast pop_front and push_back operations while making
fewer allocations for the same number of elements as an `std::list`.
So use an `std::deque` for storing the deferred calls of the loop.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

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