[Maps] Display filename and line number (#998)

Fix #997

Co-authored-by: Ian Homer <ihomer@worth.systems>

autoload/fzf/vim.vim

@@ -1214,7 +1214,7 @@ function! fzf#vim#maps(mode, ...)
   let curr = ''
   for line in split(cout, "\n")
     if line =~ "^\t"
-      let src = '  '.join(reverse(reverse(split(split(line)[-1], '/'))[0:2]), '/')
+      let src = "\t".substitute(matchstr(line, '/\zs[^/\\]*\ze$'), ' [^ ]* ', ':', '')
       call add(list, printf('%s %s', curr, s:green(src, 'Comment')))
       let curr = ''
     else