[wifi] set adjustViewBounds on the modern wifi view

The way our layouts for mobile/wifi work currently is that we
want to use wrap_content when NewStatusBarIcons is on, but the old wifi
layout doesn't use that property of ImageView.

The bug: with NewStatusBarIcons enabled, the wifi icon doesn't resize
with the font size setting correctly

The fix: settings ImageView.adjustViewBounds will resize the ImageView
and allow the wrap_content property to work correctly.

Test: manual
Bug: 402608850
Flag: com.android.settingslib.flags.new_status_bar_icons
Flag: com.android.systemui.status_bar_root_modernization
Change-Id: I03c8e2e886f9546a8e8457042391ef00184a2b42