patch 8.0.1579: virtual replace test fails in GUI

Problem:    Virtual replace test fails in GUI.
Solution:   Don't save key options if they were not set.
diff --git a/src/version.c b/src/version.c
index a6f9abd..5850cba 100644
--- a/src/version.c
+++ b/src/version.c
@@ -767,6 +767,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1579,
+/**/
     1578,
 /**/
     1577,