Create a valid ActivityOptions Bundle even for default animations

The ActivityOptions bundle can hold additional information beyond the
animation details (such as the usage time report, launch, display id, etc). We
need to return a non-null Bundle even if we're using the default animations to
retain that information.

Test: Added in 8209c4bf

BUG: 34235073
Change-Id: If69edadb3f7ff937f07fc618bddbd10cf46666e6