[Memory Leak] Fix leak of Launcher activity from recent view's input consumer

Ensure we always clear the consumer, which has strong ref to RecentsView and launcher activity, once gesture is ended

Fix: 407823225
Test: presubmit
Flag: NONE - released code
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:222fb581bda7f16b8f44c41aae489a025507ef51)
Merged-In: I90f2212247965697a4077890404bb577943efa37
Change-Id: I90f2212247965697a4077890404bb577943efa37