patch 8.1.0449: when 'rnu' is set folded lines are not displayed correctly

Problem:    When 'rnu' is set folded lines are not displayed correctly.
            (Vitaly Yashin)
Solution:   When only redrawing line numbers do draw folded lines.
            (closes #3484)
diff --git a/src/version.c b/src/version.c
index 928a07e..a0aa0dc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    449,
+/**/
     448,
 /**/
     447,