patch 8.2.2123: after using a complete popup the buffer is listed

Problem:    After using a complete popup the buffer is listed. (Boris
            Staletic)
Solution:   Make the buffer unlisted.
diff --git a/src/version.c b/src/version.c
index 8eec20e..3c39f0e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2123,
+/**/
     2122,
 /**/
     2121,