patch 9.0.0071: command overlaps with printed text in scrollback

Problem:    Command overlaps with printed text in scrollback.
Solution:   Clear until end-of-line and use correct message chunk.
            (closes #10765, closes #10764)
diff --git a/src/testdir/test_messages.vim b/src/testdir/test_messages.vim
index 32689b0..1967a3e 100644
--- a/src/testdir/test_messages.vim
+++ b/src/testdir/test_messages.vim
@@ -233,7 +233,8 @@
 
   " Up all the way with 'g'.
   call term_sendkeys(buf, 'g')
-  call WaitForAssert({-> assert_equal('  5 5', term_getline(buf, 5))})
+  call WaitForAssert({-> assert_equal('  4 4', term_getline(buf, 5))})
+  call WaitForAssert({-> assert_equal(':%p#', term_getline(buf, 1))})
   call WaitForAssert({-> assert_equal('-- More --', term_getline(buf, 6))})
 
   " All the way down. Pressing f should do nothing but pressing