example/avtka: reduce usleep() for performance
example/avtka: reduce usleep() for performance

Testing screen response - longer sleeps causes lag, hence
real-world performance tests aren't valid.

Signed-off-by: Harry van Haaren <6e1296516ee88185cd60d9725251227ece1af74d@gmail.com>

openAVproductions/openAV-Ctlra