Remove augroup

[scauligi]

See bullet number 2 under :help ftdetect:

Note that there is no "augroup" command, this has already been done when sourcing your file.

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Vim's builtin filetype.vim already sets up an augroup (filetypedetect) before it sources all ftdetect/*.vim files. Creating augroups within an ftdetect file causes the autocmds (and also the autocmds from all later plugin ftdetects) to no longer be a part of the filetypedetect augroup.

This causes later problems, such as :filetype detect not properly setting the filetype, since it only executes filetypedetect autocmds.

[benknoble]

Looks like this came from #28, which I must have elected not to pull into my version.