misc/vim: send Fmt errors to the quickfix list instead of the location list.

Output from gofmt is a list of errors, so they should appear in the error list.

R=adg
CC=golang-dev
https://golang.org/cl/33760043

misc/vim/ftplugin/go/fmt.vim

@@ -57,7 +57,7 @@ function! s:GoFormat()
         endif
         undo
         if !empty(errors)
-            call setloclist(0, errors, 'r')
+            call setqflist(errors, 'r')
         endif
         echohl Error | echomsg "Gofmt returned error" | echohl None
     endif