patch 8.2.3831: opfunc test fails when missing feature changes function name

Problem:    Opfunc test fails when missing feature changes function name.
            (Dominique Pellé)
Solution:   Check the relevant screen line instead of using a screendump.
            (closes #9360)

src/version.c

@@ -749,6 +749,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3831,
 /**/
     3830,
 /**/