Expand icon in folder tree too small

When the icon for expanding a tree in the folder list was changed from the
plus sign to the arrow as it is now, the target is very small. I suggest
making it larger, many users will be confused when they think they hit it and
it doesn't reliably expand the tree (I was for a while, until I figured out
the visual pointer feedback, but I have to be very touchy to hit it!).

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