patch 8.0.1103: converting cterm color fails for grey ramp

Problem:    Converting cterm color fails for grey ramp.
Solution:   Use index instead of number.
diff --git a/src/terminal.c b/src/terminal.c
index 624d61c..4e8f370 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -2437,9 +2437,9 @@
     {
 	/* 24 grey scale ramp */
 	idx = nr - 232;
-	rgb->blue  = grey_ramp[nr];
-	rgb->green = grey_ramp[nr];
-	rgb->red   = grey_ramp[nr];
+	rgb->blue  = grey_ramp[idx];
+	rgb->green = grey_ramp[idx];
+	rgb->red   = grey_ramp[idx];
     }
 }
 
diff --git a/src/version.c b/src/version.c
index 6acd645..f0d745b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1103,
+/**/
     1102,
 /**/
     1101,