Refresh Task overlay when thumbnail is refreshed

- TaplTestQuickStep.testOverviewActions is failing on cuttlefish large screens due to overview actions being disabled by NO_THUMBNAIL, which should be caused by thumbnail being loaded after overlay is enabled, a overlay refresh after thumbnails is loaded should fix the problem

Bug: 193125090
Test: manual
Change-Id: I3fa8093012c3d22adac49e5e0716576706a85dfa