patch 8.2.5093: error message for unknown command may have the command twice

Problem:    Error message for unknown command may mention the command twice.
            (Malcolm Rowe)
Solution:   Add the did_append_cmd flag. (closes #10570)
diff --git a/src/version.c b/src/version.c
index f21efe1..50c6ed3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5093,
+/**/
     5092,
 /**/
     5091,