patch 9.1.0807: tests: having 'nolist' in modelines isn't always desired

Problem:  tests: having 'nolist' in modelines isn't always desired
Solution: remove 'nolist' from modeline (zeertzjq)

closes: #15910

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/gen_opt_test.vim b/src/testdir/gen_opt_test.vim
index 9d942af..1c231f9 100644
--- a/src/testdir/gen_opt_test.vim
+++ b/src/testdir/gen_opt_test.vim
@@ -481,4 +481,4 @@
 
 qa!
 
-" vim:sw=2:ts=8:noet:nolist:nosta:
+" vim:sw=2:ts=8:noet:nosta: