Remove toast in power save mode

Redundant since animations are now shown even in battery saver.

Bug: 161458152
Fix: 161458152
Test: verified that both animations and the toast show up at head;
removed toast code; verified that animation still appears in both
regular and extreme battery saver mode.

Change-Id: I55ba9a72dfe2f3f9741aca9dd719283dce114bce