deleted color not applied to new messages

This fixed it for me:

```diff
--- .mutt/dracula.muttrc.orig Fri Apr 19 15:20:05 2019
+++ .mutt/dracula.muttrc Fri Apr 19 15:20:10 2019
@@ -16,12 +16,12 @@
color tree color141 default

# message index ------ foreground ---- background -----------------------------
-color index color210 default ~D # deleted messages
color index color84 default ~F # flagged messages
color index color117 default ~N # new messages
color index color212 default ~Q # messages which have been replied to
color index color215 default ~T # tagged messages
color index color141 default ~v # messages part of a collapsed thread
+color index color210 default ~D # deleted messages

# message headers ---- foreground ---- background -----------------------------
color hdrdefault color117 default
```