patch 8.2.2189: cannot repeat a command that uses the small delete register

Problem:    Cannot repeat a command that uses the small delete register.
Solution:   Store the register name instead of the contents. (Christian
            Brabandt, closes #7527)
diff --git a/src/version.c b/src/version.c
index d6eaf8d..65dfcdf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2189,
+/**/
     2188,
 /**/
     2187,