patch 9.0.1552: CI: sound-dummy module is not installed

Problem:    CI: sound-dummy module is not installed.
Solution:   Invert using the result of the condition.  (closes #12394)
diff --git a/src/version.c b/src/version.c
index cc7c4e1..2f2fa12 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1552,
+/**/
     1551,
 /**/
     1550,