Tracker: Don't offset text in selection box

Either the offset was a workaround for some BeOS bug or
backwards compatibility (I know of at least a vertical off-by-one
text positioning on BeOS for backwards compatibility reasons), or
the Haiku (FreeType) text rendering simply differs slightly, which
can't be avoided. In any case, relevant here is what looks better.
Should fix #1319.
Tracker: Revert not offsetting the text.

It actually looked better before. It completely depends
on the first and last letter of the text whether there is
a pixel too much on the left or right. On average, it
looks better with the offset, since the string width often
includes the spacing needed before the next glyph on the
right, while the string touches the bounding box on the left.
What should be changed is how tight everything is in general,
the selection box should simply extend more outward. But I
don't really feel like diving into that right now.