Sokoban: make vertical levels horizontal to better fit the screen

[iliazeus]

Some levels (in the "Microban" back, at least) are way too small, but only take up less than half of the screen:

Screenshot: Microban, level 8


This PR makes vertical levels into horizontal ones to better fit the screen.

The levels were processed by this Node.js script: https://gist.github.com/iliazeus/9fd14a338c21d5f5441a8351c955fcfe

[iliazeus]

Here's a screenshot of a rotated (well, "transposed" would be a better word) level, for comparison:

Screenshot: Microban, level 8, horizontal