patch 9.0.1306: no regression test for solved problem of #11959

Problem:    No regression test for solved problem of #11959.
Solution:   Add a test, also with 'list' set. (closes #11959)
diff --git a/src/version.c b/src/version.c
index a26fd5d..f3877e4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1306,
+/**/
     1305,
 /**/
     1304,