Try to initialize enemies on unique Y coordinates

That is, our PRNG algorithm is so stupid that sometimes it cycles into
the same value multiple times. While play testing, sometimes we were so
unlucky that we got all enemies on the same Y screen coordinate.

As funny as these situations can be, this shouldn't happen, so I have
introduced an (awesomely named) function that makes a harder effort at
finding a unique random number.

Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>

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