patch 8.1.0259: no test for fixed quickfix issue

Problem:    No test for fixed quickfix issue.
Solution:   Add a test.  Clean up the code a bit. (Yegappan Lakshmanan)
diff --git a/src/version.c b/src/version.c
index 4f31d66..dadb978 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    259,
+/**/
     258,
 /**/
     257,