Fixed a issue where notification icons don't align vertically while peeking

Hide notification in shelf when the height doesn't exceed appearEnd
position.

Fixes: 77546749
Test: manual, 1) set "Simulate a display with a cutout" to Double display
cutout, 2) pull the notification panel down and observe the icon
position.

Change-Id: I5f21188f528f3283256828d0a70aad52ca52c6dc