patch 8.0.0488: running tests leaves an "xxx" file behind

Problem:    Running tests leaves an "xxx" file behind.
Solution:   Delete the 'verbosefile' after resetting the option.
diff --git a/src/version.c b/src/version.c
index c9d7361..c620780 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    488,
+/**/
     487,
 /**/
     486,