Remove a flaky smoke test we no longer need

test/smoke_test.vader

@@ -139,43 +139,3 @@ Execute(Linters should run in PowerShell too):
     \ },
     \], ale#test#GetLoclistWithoutNewerKeys()
   endif
-
-Execute(Previous errors should be removed when linters change):
-  call ale#Queue(0, '')
-  call ale#test#WaitForJobs(2000)
-
-  call ale#linter#Reset()
-
-  call ale#linter#Define('foobar', {
-  \ 'name': 'testlinter2',
-  \ 'callback': 'TestCallback2',
-  \ 'executable': has('win32') ? 'cmd' : 'echo',
-  \ 'command': has('win32') ? 'echo baz boz' : '/bin/sh -c ''echo baz boz''',
-  \})
-
-  let g:expected_results = [{
-  \ 'bufnr': bufnr('%'),
-  \ 'lnum': 3,
-  \ 'vcol': 0,
-  \ 'col': 4,
-  \ 'text': 'baz boz',
-  \ 'type': 'E',
-  \ 'nr': -1,
-  \ 'pattern': '',
-  \ 'valid': 1,
-  \}]
-
-  " Try the test a few times over in NeoVim 0.3 or VIm 8.2 or Windows,
-  " where tests fail randomly.
-  for g:i in range(has('nvim-0.3') || has('win32') || has('patch-8.2.2401') ? 5 : 1)
-    call ale#Queue(0, '')
-    call ale#test#WaitForJobs(2000)
-
-    let g:results = ale#test#GetLoclistWithoutNewerKeys()
-
-    if g:results == g:expected_results
-      break
-    endif
-  endfor
-
-  AssertEqual g:expected_results, g:results