Make chevron disclosure button look better in dark mode

iOS/AppAssets.swift

@@ -48,10 +48,6 @@ struct AppAssets {
 		return UIImage(systemName: "circle")!
 	}()
 	
-	static var sectionChevronDisclosureColor: UIColor = {
-		return UIColor(named: "sectionChevronDisclosureColor")!
-	}()
-	
 	static var chevronDownImage: UIImage = {
 		return UIImage(systemName: "chevron.down")!
 	}()

iOS/MasterFeed/Cell/MasterFeedTableViewSectionHeader.swift

@@ -131,7 +131,7 @@ private extension MasterFeedTableViewSectionHeader {
 	}
 	
 	func updateDisclosureImage() {
-		disclosureView.tintColor = AppAssets.sectionChevronDisclosureColor
+		disclosureView.tintColor = UIColor.tertiaryLabel
 		if disclosureExpanded {
 			disclosureView.image = AppAssets.chevronDownImage
 		} else {

iOS/Resources/Assets.xcassets/sectionChevronDisclosureColor.colorset/Contents.json

@@ -1,20 +0,0 @@
-{
-  "info" : {
-    "version" : 1,
-    "author" : "xcode"
-  },
-  "colors" : [
-    {
-      "idiom" : "universal",
-      "color" : {
-        "color-space" : "srgb",
-        "components" : {
-          "red" : "200",
-          "alpha" : "1.000",
-          "blue" : "200",
-          "green" : "200"
-        }
-      }
-    }
-  ]
-}