patch 8.2.2851: using <Cmd> mapping on the command line triggers CmdlineChanged

Problem:    Using <Cmd> mapping on the command line triggers CmdlineChanged.
            (Naohiro Ono)
Solution:   Jump to cmdline_not_changed if the command line didn't change.
            (closes #8208)
diff --git a/src/version.c b/src/version.c
index 83c773f..0d3c2ad 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2851,
+/**/
     2850,
 /**/
     2849,