Fix doubled comma in autocmd (#791)

The doubled comma (,,) in the list of autocmd patterns introduces a
blank pattern which matches all filenames in the most recent version of
neovim, causing the default filetype to be sh unless another rule
overrides it.

Author: entrez

autoload/polyglot/init.vim

@@ -3510,7 +3510,7 @@ au BufNewFile,BufRead .reminders*		call s:StarSetf('remind')
 au BufNewFile,BufRead sgml.catalog*		call s:StarSetf('catalog')
 
 " Shell scripts ending in a star
-au BufNewFile,BufRead .bashrc*,.bash[_-]profile*,.bash[_-]logout*,.bash[_-]aliases*,bash-fc[-.]*,,PKGBUILD* call polyglot#ft#SetFileTypeSH("bash")
+au BufNewFile,BufRead .bashrc*,.bash[_-]profile*,.bash[_-]logout*,.bash[_-]aliases*,bash-fc[-.]*,PKGBUILD* call polyglot#ft#SetFileTypeSH("bash")
 au BufNewFile,BufRead .kshrc* call polyglot#ft#SetFileTypeSH("ksh")
 au BufNewFile,BufRead .profile* call polyglot#ft#SetFileTypeSH(getline(1))