patch 9.0.1386: options test fails with some window width

Problem:    Options test fails with some window width.
Solution:   Adjust what text the test checks with. (closes #12111)
diff --git a/src/testdir/test_normal.vim b/src/testdir/test_normal.vim
index 7b775fe..03d29ae 100644
--- a/src/testdir/test_normal.vim
+++ b/src/testdir/test_normal.vim
@@ -2526,8 +2526,11 @@
   norm! g'a
   call assert_equal('>', a[-1:])
   call assert_equal(1, line('.'))
+  let v:errmsg = ''
   call assert_nobeep("normal! g`\<Esc>")
+  call assert_equal('', v:errmsg)
   call assert_nobeep("normal! g'\<Esc>")
+  call assert_equal('', v:errmsg)
 
   " Test for g; and g,
   norm! g;