patch 8.2.4722: ending recording with mapping records too much

Problem:    When a recording is ended with a mapped key that key is also
            recorded.
Solution:   Remember the previous last_recorded_len. (closes #10122)
diff --git a/src/version.c b/src/version.c
index 1b2a188..410fe2a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4722,
+/**/
     4721,
 /**/
     4720,