Wi-Fi, now corporeal!

Given a state where the Wi-Fi icon could overflow (i.e. on the lock
screen with mobile data and other icons showing:

Killing the sysui process could cause the whole wifi icon to become
hidden, and it never was unhidden.

Test: With the overflow space in use, `adb shell kill $(pid com.android.systemui)`
Change-Id: I026923b3dae16b9afa1a5acc3bd88887816a6391
Fixes: 80577291