patch 8.2.4852: ANSI color index to RGB value not correct

Problem:    ANSI color index to RGB value not correct.
Solution:   Convert the cterm index to ANSI index. (closes #10321,
            closes #9836))
diff --git a/src/version.c b/src/version.c
index 7b36e62..b03e661 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4852,
+/**/
     4851,
 /**/
     4850,