Scale folders to fit within the available height and width.

* In the previous implementation, the folder icon size would
not get updated if the cell height/width was set to the minimum
value not including the folderChildIconSizePx AND the usedLength
was less than the maxLength.
* The bug is only really noticeable in an unlikely multi-window
landscape mode, which is why it was not noticed before.

Change-Id: I776c6f710e081645cff891487022cf787869ee3f
1 file changed