Bug 921800 - [Buri][fugu][Home screen][call]Can't enter into setting again during a call if the settings was in the foreground.
Merge pull request #15150 from luke-chang/921800_cannot_relaunch_app_under_attention_screen

Bug 921800 - [Buri][fugu][Home screen][call]Can't enter into setting again during a call if the settings was in the foreground, r=alive