examples/mux-environmentyaml: Don't use local filters.

Remove lines that contains local filters, which is a feature
that is disabled by now (it's broken).

Signed-off-by: Rudá Moura <rmoura@redhat.com>
Merge pull request #235 from ruda/examples_mux_remove_local_filters

examples/mux-environmentyaml: Don't use local filters.