Modified example/wedding.py and related files to maximize happiness

[aralsea]

This PR is a simple fix in example/wedding.py. Since the objective function is defined as happiness, it makes more sense to use maximize rather than minimize.

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[pchtsp]

I think you then have to change the returned value of the happiness function, to keep it working as before. For exmple by multiplying by minus 1 or making the inverse of the value

[aralsea]

@pchtsp Thank you for your quick feedback!
Based on the code code content, I initially thought that the definition of the happiness function seems to have been chosen somewhat arbitrarily, so I didn't make the inverse. If you think an adjustment would improve the function’s consistency, I’d be happy to make the change.

[aralsea]

In addition, I also added similar changes to related files that I initially missed.