Make Navbar Secondary Handle Appear Correctly

Fixed issue where the secondary handle appears on the edge for a little bit when switching from immersive mode in portrait (such as watching a youtube video) to another app via quickswitch. Secondary handle no longer temporarily appears.

Flag: NONE
Test: Manually tested in Felix folded mode by holding phone vertically while watching a youtube video, trying to go to another app via quickswitch.
Bug: 299188745
Change-Id: Iabc3e7dc883cf06a4770bdb45621b4c52a871132