patch 8.2.4551: when mapping <Esc> terminal codes are not recognized

Problem:    When mapping <Esc> terminal codes are not recognized.
Solution:   Specifically recognize a mapping with just <Esc> and check for
            terminal codes even though there is no partial mapping.
            (closes #9903)
diff --git a/src/version.c b/src/version.c
index d5b9380..13f5da3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4551,
+/**/
     4550,
 /**/
     4549,