patch 8.2.5018: Vim9: some code is not covered by tests

Problem:    Vim9: some code is not covered by tests.
Solution:   Delete dead code.
diff --git a/src/version.c b/src/version.c
index 980ddff..690a703 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5018,
+/**/
     5017,
 /**/
     5016,