patch 8.0.1759: memory leak from duplicate options

Problem:    Memory leak from duplicate options. (Yegappan Lakshmanan)
Solution:   Don't set the default value twice.
diff --git a/src/version.c b/src/version.c
index dfd82f9..c25fcf1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1759,
+/**/
     1758,
 /**/
     1757,