Update nav bar layout for universal grid

Test: visual
Bug: 37115488
Change-Id: I43fe6648f56d25f41fadefcaa27d2c0cf3f077ba
diff --git a/packages/SystemUI/res/values/config.xml b/packages/SystemUI/res/values/config.xml
index 74b0702..2ad6f2d 100644
--- a/packages/SystemUI/res/values/config.xml
+++ b/packages/SystemUI/res/values/config.xml
@@ -293,7 +293,7 @@
     <string name="config_systemUIFactoryComponent" translatable="false">com.android.systemui.SystemUIFactory</string>
 
     <!-- Nav bar button default ordering/layout -->
-    <string name="config_navBarLayout" translatable="false">left,back;home;recent,right</string>
+    <string name="config_navBarLayout" translatable="false">left[.5W],back[1WC];home;recent[1WC],right[.5W]</string>
 
     <bool name="quick_settings_show_full_alarm">false</bool>