patch 9.0.0586: missing change in test

Problem:    Missing change in test.
Solution:   Add the test change.
diff --git a/src/testdir/test_messages.vim b/src/testdir/test_messages.vim
index a92a580..0100ba9 100644
--- a/src/testdir/test_messages.vim
+++ b/src/testdir/test_messages.vim
@@ -365,15 +365,14 @@
   let content =<< trim END
     echom range(9999)->join("\x01")
   END
-  call writefile(content, 'Xtest_quit_message')
-  let buf = RunVimInTerminal('-S Xtest_quit_message', #{rows: 6, wait_for_ruler: 0})
-  call WaitForAssert({-> assert_match('^-- More --', term_getline(buf, 6))})
+  call writefile(content, 'Xtest_quit_message', 'D')
+  let buf = RunVimInTerminal('-S Xtest_quit_message', #{rows: 10, wait_for_ruler: 0})
+  call WaitForAssert({-> assert_match('^-- More --', term_getline(buf, 10))})
   call term_sendkeys(buf, "q")
   call VerifyScreenDump(buf, 'Test_quit_long_message', {})
 
   " clean up
   call StopVimInTerminal(buf)
-  call delete('Xtest_quit_message')
 endfunc
 
 " this was missing a terminating NUL
diff --git a/src/version.c b/src/version.c
index 22e5424..30fe48d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    586,
+/**/
     585,
 /**/
     584,