Highlight item when in favorites

Passepartout-iOS/Global/Theme.swift

@@ -160,6 +160,16 @@ extension UIActivityIndicatorView {
     }
 }
 
+extension UIBarButtonItem {
+    func apply(_ theme: Theme) {
+        tintColor = nil
+    }
+
+    func applyAccent(_ theme: Theme) {
+        tintColor = theme.palette.accent1
+    }
+}
+
 // XXX: status bar is broken
 extension MFMailComposeViewController {
     func apply(_ theme: Theme) {

Passepartout-iOS/Scenes/ProviderPoolViewController.swift

@@ -94,6 +94,9 @@ class ProviderPoolViewController: UIViewController {
         isShowingFavorites = !isShowingFavorites
         if isShowingFavorites {
             reloadFavorites()
+            navigationItem.rightBarButtonItem?.applyAccent(.current)
+        } else {
+            navigationItem.rightBarButtonItem?.apply(.current)
         }
         tableView.reloadData()
     }