patch 8.1.1732: completion in cmdwin does not work for buffer-local commands

Problem:    Completion in cmdwin does not work for buffer-local commands.
Solution:   Use the right buffer. (closes #4711)
diff --git a/src/version.c b/src/version.c
index d8b3dfe..cdff0d3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1732,
+/**/
     1731,
 /**/
     1730,