Revert "Fix a bug with the 'ball bounces' stat."

This reverts commit 1891902f0a7dfbd3c2e7f55d2262aed10b3948df.
This fix isn't really good because if the FPS drops down, some
bounces might not be accounted for.
Fix issue #46, which deals with breakable platforms.

A test level with the file name of Bug46.xml is included. It is an
example of a level that was exhibiting the issue.
Add an extra attempt to level 7.
Set the default number of attempts to 3.
Add level 8.

Yes, the '8' for the number of balls is not a typo.