snake: option is broken

--snake option is broken on f3ca549. As the following output shows:

XXX
-X-
-X-
XXX

XX-
-XX
-X-
XXX

--X
XXX
-X-
XXX

Number of polyominoes: 3
./bin/polyenum -b 3 -k 4 --snake --maximal-inscribed  0.00s user 0.00s system 66% cpu 0.010 total

The --snake option doesn't ouput snakes, but trees.

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