Improve guard so it works for no eof new line

indent/fsharp.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'fsharp') == -1
+
 " Vim indent file
 " Language:     FSharp
 " Maintainers:  Jean-Francois Yuen   <jfyuen@happycoders.org>
@@ -248,4 +249,5 @@ function! GetFsharpIndent()
 endfunction
 
 " vim: sw=4 et sts=4
+
 endif