plugins/screencast: Reset last sent timestamp when the stream resumes
Hypothetically, if the stream is paused and restarted in a short burst, the frame throttling logic can be mis-triggered.
(cherry picked from commit 24f4e268)
Hypothetically, if the stream is paused and restarted in a short burst, the frame throttling logic can be mis-triggered.
(cherry picked from commit 24f4e268)