patch 8.1.1471: 'background' not correctly set for 2-digit rgb termresponse

Problem:    'background' not correctly set for 2-digit rgb termresponse.
Solution:   Adjust what digit to use. (closes #4495)
diff --git a/src/version.c b/src/version.c
index b7d58e9..366e56b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1471,
+/**/
     1470,
 /**/
     1469,