[FP5-2896] [Desktop moke]The application interface in the recent interface is blank after disconnect the second screen

* Root Cause
  disconnet desktop Task snapshot is null
* Solution
  refresh task when desktop is on
* Test Steps
  test Desktop
* Test Result
  pass

Change-Id: I87a5d1e90c3080ae114a63b4a813263243a44e25
2 files changed