patch 8.0.1631: testing with Vim running in terminal is a bit flaky

Problem:    Testing with Vim running in terminal is a bit flaky.
Solution:   Delete any .swp file so that later tests don't fail.
diff --git a/src/version.c b/src/version.c
index 84f2a3e..473883c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -767,6 +767,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1631,
+/**/
     1630,
 /**/
     1629,