test: avoid repeated screen lines in expected states

This is the command invoked repeatedly to make the changes:

    :%s/^\(.*\)|\%(\*\(\d\+\)\)\?$\n\1|\%(\*\(\d\+\)\)\?$/\=submatch(1)..'|*'..(max([str2nr(submatch(2)),1])+max([str2nr(submatch(3)),1]))/g

test/functional/ex_cmds/quickfix_commands_spec.lua

@@ -137,10 +137,7 @@ it(':vimgrep can specify Unicode pattern without delimiters', function()
   feed('i→<Esc>:vimgrep →')
   screen:expect([[
     {1:→}                                       |
-    {0:~                                       }|
-    {0:~                                       }|
-    {0:~                                       }|
-    {0:~                                       }|
+    {0:~                                       }|*4
     :vimgrep →^                              |
   ]])
 end)