patch 8.1.1855: another failing timer test

Problem:    Another failing timer test.
Solution:   Assert that timers are finished by the end of the test.  Rename
            test functions to make them easier to find.
diff --git a/src/version.c b/src/version.c
index e497399..28fd2a7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1855,
+/**/
     1854,
 /**/
     1853,