g:markdown_folding = 1 and g:javaScript_fold = 1 set foldmethod to syntax 

If the `vimrc` contains

```vim
let g:markdown_folding = 1
let g:javaScript_fold = 1
```

then `set filetype=markdown` and `set foldmethod?` gives the output

```vim
foldmethod=syntax
        Impostata l'ultima volta da /usr/share/vim/vim80/syntax/javascript.vim
```

in Vim 8.0. Instead, expected is 

```vim
foldmethod=expr
```
