insert-layout: Don't remove autocmds in `InsertLayoutOn`

I assumed that I should be removing existing autocmds before adding new
ones. If you ran the `:InsertLayout` command more than once, I didn't
want old autocmds to stick around.

The line was commented out because it fails on the first call to
`:InsertLayout`, since at that point the `insert_layout` augroup doesn't
exist.

On closer inspection, however, it turns out that the old autocmds are
not retained when running `:InsertLayout` subsequent times. Rather, the
newly-defined ones are overwriting the old ones. So we don't need to
worry about removing the old autocmds before adding new ones.

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