patch 8.2.3730: "/etc/Muttrc.d/README" gets filetype muttrc

Problem:    "/etc/Muttrc.d/README" gets filetype muttrc.
Solution:   Move the Muttrc.d pattern down, add exception for *.rc files.
diff --git a/src/version.c b/src/version.c
index 2923f2d..d0057b3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3730,
+/**/
     3729,
 /**/
     3728,