Fixed timeout units in events timing test
Fixed timeout units in events timing test

A units mistake led to passing 20000 seconds instead of 20000 milliseconds
to greentea. The would cause the test to spin for 6 hours if it got stuck
anywhere.

j-greffe/mbed-os,j-greffe/mbed-os,j-greffe/mbed-os,j-greffe/mbed-os,j-greffe/mbed-os,j-greffe/mbed-os