patch 9.1.0585: tests: test_cpoptions leaves swapfiles around

Problem:  tests: test_cpoptions leaves swapfiles around
Solution: Use :bw! instead of :close!

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index c0fdd46..15b8deb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    585,
+/**/
     584,
 /**/
     583,