patch 8.0.1728: condition always false, useless code

Problem:    Condition always false, useless code.
Solution:   Remove the code. (Nikolai Pavlov, closes #2808)
diff --git a/src/version.c b/src/version.c
index ec58863..edbe2ae 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1728,
+/**/
     1727,
 /**/
     1726,