patch 8.0.1222: test functions interfere with each other

Problem:    Test functions interfere with each other.
Solution:   Cleanup tab pages, windows and buffers.  Reset option.
diff --git a/src/version.c b/src/version.c
index 88d8995..1cb437b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1222,
+/**/
     1221,
 /**/
     1220,