Wood UI additions

[stripes-8]

Hello. Just made some minor changes to the Wood UI, and thought I might as well submit them in case anyone else thinks they are worth keeping.

Changes:

• File list scrolls when the selection passes half of the list rather than the very end.
• Directory path is only displayed if directories are shown. (This is what chyyran did before.)
• Changed list view line width from 11 to 15 to make the file list easier to read. (This is also what chyyran did before.)

This was tested on my half of a DS Lite.

In addition, I also have an alternate 'white' theme which was edited (with very little effort) from the 'black' theme. I could upload this somewhere too if anyone is interested.

Pull Request status

• [ ] This PR has been tested using the latest version of devkitARM and libnds.

[RocketRobz]

Reverted due to this introducing these bugs:

1. On startup, if the selection is not the first 4 listed (in icon view mode), the selection bar overwrites the top screen image and/or other graphics.
2. Pressing Left/Right also causes the above bug.

[stripes-8]

Yes, I should have tested this more thoroughly. Thanks for pointing that out, I'll try fixing it.