Revert "ghostpad: copy sticky events to SRC ghostpads"
Revert "ghostpad: copy sticky events to SRC ghostpads"

This reverts commit 8162a583a4dd68582bf186e2e47a8f0d68fa1980.

Automatically copying the sticky events makes it impossible for apps
and elements to filter the events with event probes. This causes
regressions (See #719437). The best option is to let the app/element
copy and filter the events themselves after the ghostpad target is
set.

justinjoy/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer