Use filled stars

app/src/main/java/eu/faircode/email/AdapterContact.java

@@ -159,7 +159,7 @@ public class AdapterContact extends RecyclerView.Adapter<AdapterContact.ViewHold
                     : Helper.getRelativeTimeSpanString(context, contact.last_contacted));
 
             ivFavorite.setImageResource(contact.state == EntityContact.STATE_FAVORITE
-                    ? R.drawable.twotone_star_24 : R.drawable.twotone_star_border_24);
+                    ? R.drawable.baseline_star_24 : R.drawable.twotone_star_border_24);
             ivFavorite.setImageTintList(ColorStateList.valueOf(
                     contact.state == EntityContact.STATE_FAVORITE ? colorAccent : textColorSecondary));
             ivFavorite.setContentDescription(contact.state == EntityContact.STATE_FAVORITE

app/src/main/java/eu/faircode/email/AdapterFolder.java

@@ -373,7 +373,7 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
 
                 tvFlagged.setText(NF.format(folder.flagged));
                 ibFlagged.setImageResource(folder.flagged == 0
-                        ? R.drawable.twotone_star_border_24 : R.drawable.twotone_star_24);
+                        ? R.drawable.twotone_star_border_24 : R.drawable.baseline_star_24);
                 tvFlagged.setEnabled(folder.flagged > 0);
                 ibFlagged.setEnabled(folder.flagged > 0);