Update gesture nav tutorial to new font style

This change applies the new expressive font style if the expressive
theme is enabled. Screenshots are available in the bug

Fix: 393615349
Test: Check that the fonts change when the expressive theme is enabled
Flag: com.android.launcher3.expressive_theme_in_taskbar_and_navigation
Change-Id: Ib67e81edfd7aa125b9aa824946616c02e24c13e6