set navigation view menu icon size for avatars according to Google's guidelines: 14sp

res/values/dims.xml

@@ -29,7 +29,7 @@
     <dimen name="nav_drawer_header_avatar_other_accounts_radius">20dp</dimen>
     <!-- margin must be nav_drawer_header_avatar_other_accounts_size+16dp -->
     <dimen name="nav_drawer_header_avatar_second_account_margin">56dp</dimen>
-    <dimen name="nav_drawer_menu_avatar_radius">16dp</dimen>
+    <dimen name="nav_drawer_menu_avatar_radius">14sp</dimen>
     <dimen name="list_item_avatar_icon_radius">20dp</dimen>
 
     <dimen name="file_icon_size">32dp</dimen>