perfetto: fix cts test
perfetto: fix cts test

We were accidentally sending messages from the producer twice, once
because of the send_on_enable flag in test code and once because the
fake producer would send again itself uncondintionally for CTS.

Remove the second send operation.

Cherry-picked from e74b8b061e54e27c360ced0beb8dbb34464878f6

Bug: 74986889
Change-Id: Iaa05067685d367f7ee8b3d2ee89922ad078b1d5c
Merged-In: Iaa05067685d367f7ee8b3d2ee89922ad078b1d5c

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto