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.

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1855,
 /**/
     1854,
 /**/