[openbeos] BBox bug

There's a problem with our implementation of BBox (in app_kit/source/lib/
interface/src). When the box is set to B_FOLLOW_ALL_SIDES and the window is 
resized the old border leaves traces all over the box's background.
I've taken a look at the code & I think there's nothing wrong with it. 
Actually, I only tried it because I had the very same problem with a BView 
subclass that I'm implementing, so I thought I'd find a solution in our BBox, 
but now it needs to be fixed too!

TIA,
Mahmoud Al Gammal

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