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)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2189,
 /**/
     2188,
 /**/