Limit number of recents entries for an app to maxRecents allowed.

Regression in the API caused by the fixes for b/28293748 and b/25460953
which prevented the task entries from been trimmed if the task don't
have the same intent filter (additional documents launched will normally
have different intent action/filter than the base activity) or it allows
multiple task entries.
We now trim when we go over the maxRecents allowed in both cases.

Bug: 30645949
Bug: 28293748
Bug: 25460953
Change-Id: I74c8ecc38f72a5d03c213dea8d3e62261d42f8f6