Don't use setlocal in syntax file (#1164)

I'm not 100% sure that one should not use `setlocal` in a syntax file,
but this breaks other filetypes that may include this syntax file, like
the vim-markdown plugin.  The `comments` and `commentstring` get set for
that markdown buffer with the jinja settings.

See
https://github.com/dhruvasagar/vim-table-mode/issues/162#issuecomment-595317626
for an example of side effects.
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