patch 9.0.2093: Unsupported option causes skipping of modeline test

Problem:  Unsupported option causes rest of modeline test to be skipped.
Solution: Revert the change from patch 8.2.1432.

closes: #13499
closes: #13500

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_modeline.vim

@@ -164,7 +164,11 @@ func Test_modeline_colon()
 endfunc
 
 func s:modeline_fails(what, text, error)
-  call CheckOption(a:what)
+  " Don't use CheckOption(), it would skip the whole test
+  " just for a single un-supported option
+  if !exists('+' .. a:what)
+    return
+  endif
   let fname = "Xmodeline_fails_" . a:what
   call writefile(['vim: set ' . a:text . ' :', 'nothing'], fname, 'D')
   let modeline = &modeline

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2093,
 /**/
     2092,
 /**/