patch 9.0.0392: inverted condition is a bit confusing

Problem:    Inverted condition is a bit confusing.
Solution:   Remove the "!" and swap the blocks. (Ken Takata)
diff --git a/src/version.c b/src/version.c
index 2edbe83..87603fc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    392,
+/**/
     391,
 /**/
     390,