Revert "Show problems from other files for gobuild and gometalinter"

This reverts commit e721f851b4.

test/handler/test_gobuild_handler.vader

@@ -28,7 +28,7 @@ Execute (The gobuild handler should handle names with spaces):
   \ ]), 'v:val[1:4]')
 
 Execute (The gobuild handler should handle relative paths correctly):
-  call ale#test#SetFilename('app/test.go')
+  silent file! /foo/bar/baz.go
 
   AssertEqual
   \ [
@@ -37,9 +37,8 @@ Execute (The gobuild handler should handle relative paths correctly):
   \     'col': 0,
   \     'text': 'missing argument for Printf("%s"): format reads arg 2, have only 1 args',
   \     'type': 'E',
-  \     'filename': ale#path#Winify(expand('%:p:h') . '/test.go'),
   \   },
   \ ],
   \ ale_linters#go#gobuild#Handler(bufnr(''), [
-  \   'test.go:27: missing argument for Printf("%s"): format reads arg 2, have only 1 args',
+  \   'baz.go:27: missing argument for Printf("%s"): format reads arg 2, have only 1 args',
   \ ])