Ensure recent documents are trimmed when relaunching.

With respect to recents trimming, documents excercise a
a special code path, where the number of open documents
is compared to a configured max documents. In fact though
if we have mandated a trim (regardless of recents size)
we don't care about this max documents number.

Bug: 24717461
Change-Id: I2ffb4a037307d666ea0a7f31d75638b64b6eab8e

services/core/java/com/android/server/am/RecentTasks.java

@@ -465,7 +465,7 @@ class RecentTasks extends ArrayList<TaskRecord> {
                     if (!sameActivity) {
                         continue;
                     }
-                    if (maxRecents > 0) {
+                    if (maxRecents > 0 && !doTrim) {
                         --maxRecents;
                         continue;
                     }