test(old): set 'display' to an empty string (#19450)

src/nvim/testdir/setup.vim

@@ -4,6 +4,7 @@ if exists('s:did_load')
   set complete=.,w,b,u,t,i
   set directory&
   set directory^=.
+  set display=
   set fillchars=vert:\|,fold:-
   set formatoptions=tcq
   set fsync

src/nvim/testdir/test_window_cmd.vim

@@ -1360,7 +1360,6 @@ func Test_win_move_separator()
 endfunc
 
 func Test_win_move_statusline()
-  redraw  " This test fails in Nvim without a redraw to clear messages.
   edit a
   leftabove split b
   let h = winheight(0)