Make Ouya mappings constant expressions

Here is the simple PR to move the `final static int` Ouya mapping values outside the `static` block so they can be considered constant expressions and be used in `switch` statements. It is now coherent with the `Input.Keys` way.

In addition, `gdx-controllers` extension source doesn't seem to be following **libgdx** own `eclipse-formatter.xml`. So, I applied it. ([Nate must be very upset](https://github.com/libgdx/libgdx/wiki/Contributing#eclipse-formatter)).