patch 8.2.3708: Vim9: test fails with different error

Problem:    Vim9: test fails with different error.
Solution:   Correct the error number.

src/testdir/test_vim9_cmd.vim

@@ -282,8 +282,7 @@ def Test_condition_types()
       elseif 'text'
       endif
   END
-  CheckDefFailure(lines, 'E1012:', 3)
-  CheckScriptFailure(['vim9script'] + lines, 'E1135:', 4)
+  CheckDefAndScriptFailure(lines, 'E1135:', 3)
 
   lines =<< trim END
       if g:cond

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3708,
 /**/
     3707,
 /**/