patch 8.2.5029: "textlock" is always zero

Problem:    "textlock" is always zero.
Solution:   Remove "textlock" and rename "textwinlock" to "textlock".
            (closes #10489)
diff --git a/src/testdir/test_popup.vim b/src/testdir/test_popup.vim
index 9832ccf..c389f63 100644
--- a/src/testdir/test_popup.vim
+++ b/src/testdir/test_popup.vim
@@ -655,7 +655,7 @@
   set completefunc=MessComplete
   new
   call setline(1, 'Ju')
-  call assert_fails('call feedkeys("A\<c-x>\<c-u>/\<esc>", "tx")', 'E578:')
+  call assert_fails('call feedkeys("A\<c-x>\<c-u>/\<esc>", "tx")', 'E565:')
   call assert_equal('Jan/', getline(1))
   bwipe!
   set completefunc=