[WifiSetup] Change illustration aspect ratio

Change the aspect ratio of the illustration to 20:9 to align with UX
mocks.

Bug: 17111669
Change-Id: I37b2ca7624b7baf156830db53d2cea97a78e2dab
diff --git a/res/layout/setup_wizard_header.xml b/res/layout/setup_wizard_header.xml
index 2409fb4..8334868 100644
--- a/res/layout/setup_wizard_header.xml
+++ b/res/layout/setup_wizard_header.xml
@@ -24,7 +24,7 @@
     android:background="@drawable/setup_illustration_bg"
     android:foreground="@drawable/setup_illustration_wifi"
     android:tag="stickyContainer"
-    settings:aspectRatio="2.0">
+    settings:aspectRatio="2.22">
 
     <TextView
         android:id="@+id/title"