patch 9.0.0786: user command does not get number from :tab modifier

Problem:    User command does not get number from :tab modifier.
Solution:   Include the number. (closes #11393, closes #6801)
diff --git a/src/version.c b/src/version.c
index f3a7e29..c39a835 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    786,
+/**/
     785,
 /**/
     784,