[modern/performance] Simplify Vector styles

Bundlesize drops as a result of no longer loading the legacy
code.

Bug: T278896
Change-Id: Ib992dd19356e563af356a616055ac297f9ad0b02

bundlesize.config.json

@@ -5,7 +5,7 @@
 	},
 	{
 		"resourceModule": "skins.vector.styles",
-		"maxSize": "11 kB"
+		"maxSize": "9 kB"
 	},
 	{
 		"resourceModule": "skins.vector.legacy.js",

skin.json

@@ -126,9 +126,12 @@
 			"features": {
 				"normalize": true,
 				"elements": true,
-				"content": true,
+				"content-media": true,
 				"interface": true,
-				"legacy": true
+				"interface-category": true,
+				"i18n-ordered-lists": true,
+				"i18n-all-lists-margins": true,
+				"i18n-headings": true
 			},
 			"targets": [
 				"desktop",