patch 8.2.5029: "textlock" is always zero

Problem:    "textlock" is always zero.
Solution:   Remove "textlock" and rename "textwinlock" to "textlock".
            (closes #10489)

src/testdir/test_edit.vim

@@ -1041,7 +1041,7 @@ func Test_edit_completefunc_delete()
   set completefunc=CompleteFunc
   call setline(1, ['', 'abcd', ''])
   2d
-  call assert_fails("normal 2G$a\<C-X>\<C-U>", 'E578:')
+  call assert_fails("normal 2G$a\<C-X>\<C-U>", 'E565:')
   bwipe!
 endfunc
 

src/testdir/test_ins_complete.vim

@@ -698,7 +698,7 @@ func Test_completefunc_error()
   endfunc
   set completefunc=CompleteFunc
   call setline(1, ['', 'abcd', ''])
-  call assert_fails('exe "normal 2G$a\<C-X>\<C-U>"', 'E578:')
+  call assert_fails('exe "normal 2G$a\<C-X>\<C-U>"', 'E565:')
 
   " delete text when called for the second time
   func CompleteFunc2(findstart, base)
@@ -710,7 +710,7 @@ func Test_completefunc_error()
   endfunc
   set completefunc=CompleteFunc2
   call setline(1, ['', 'abcd', ''])
-  call assert_fails('exe "normal 2G$a\<C-X>\<C-U>"', 'E578:')
+  call assert_fails('exe "normal 2G$a\<C-X>\<C-U>"', 'E565:')
 
   " Jump to a different window from the complete function
   func CompleteFunc3(findstart, base)

src/testdir/test_popup.vim

@@ -655,7 +655,7 @@ func Test_complete_func_mess()
   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=

src/testdir/test_quickfix.vim

@@ -3474,7 +3474,7 @@ endfunc
 func Test_vimgrep_with_textlock()
   new
 
-  " Simple way to execute something with "textwinlock" set.
+  " Simple way to execute something with "textlock" set.
   " Check that vimgrep without jumping can be executed.
   au InsertCharPre * vimgrep /RunTheTest/j runtest.vim
   normal ax