patch 8.1.2040: no highlighting of current line in quickfix window

Problem:    No highlighting of current line in quickfix window.
Solution:   Combine with line_attr.
diff --git a/src/version.c b/src/version.c
index a2f6417..bf0d350 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2040,
+/**/
     2039,
 /**/
     2038,