patch 8.1.1679: test using SwapExists autocommand file may fail

Problem:    Test using SwapExists autocommand file may fail.
Solution:   Remove the SwapExists autocommand.
diff --git a/src/version.c b/src/version.c
index e48dd60..3263f69 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1679,
+/**/
     1678,
 /**/
     1677,