supertux: fix sh equality operator
supertux: fix sh equality operator

Signed-off-by: Andreas Oberritter <5c504a8ae171602809046bde94878da7dbc4e5ab@opendreambox.org>
Acked-by: Michael Smith <3f5005aab17d0ac4ac1327237c53ad461fb34e8a@cbnco.com>

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