Update lesson module font

course/styles/gold.json

@@ -238,7 +238,7 @@
 			},
 			"sensei-lms/course-theme-lesson-module": {
 				"typography": {
-					"letterSpacing": "0.04em",
+					"fontFamily": "var(--wp--preset--font-family--heading)",
 					"fontWeight": "700",
 					"lineHeight": "1.21"
 				}