Only WTF when trying to use remote animation in ActivityOptions

There is a legitimate use case when sending a PendingIntent from
within system_server, for example AlarmManager. However, we used
to WTF always in this case.

To fix this, we only WTF when trying to use a remote animation
that originates from within system_server.

Test: Boots, open apps
Change-Id: I7bafae9f899cbb8966cf22166270000ce887baba
Fixes: 79417917