patch 8.1.1349: if writing runs into conversion error backup file is deleted

Problem:    If writing runs into a conversion error the backup file is
            deleted. (Arseny Nasokin)
Solution:   Don't delete the backup file is the file was overwritten and a
            conversion error occurred. (Christian Brabandt, closes #4387)
diff --git a/src/version.c b/src/version.c
index a658c5a..efddd3e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1349,
+/**/
     1348,
 /**/
     1347,