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))

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4852,
 /**/
     4851,
 /**/