Fix typo in pathogen#surround()

Closes #157

Author: Lifepillar

autoload/pathogen.vim

@@ -108,7 +108,7 @@ endfunction "}}}1
 function! pathogen#surround(path) abort
  let sep = pathogen#slash()
  let rtp = pathogen#split(&rtp)
- let path = fnamemodify(a:path, ':p:?[\\/]\=$??')
+ let path = fnamemodify(a:path, ':p:s?[\\/]\=$??')
  let before = filter(pathogen#expand(path), '!pathogen#is_disabled(v:val)')
  let after = filter(reverse(pathogen#expand(path.sep.'after')), '!pathogen#is_disabled(v:val[0:-7])')
  call filter(rtp, 'index(before + after, v:val) == -1')