Patch: don't save tiles that are equal to the default tile

[Dmitry Kazakov]

I don't think we need this.

KisTileHashTableIterator returns the number of non-default tiles, or (more
precisely) the number of preallocated tiles. After you fixed the extents
bug, these terms coincide. So this check is superfluous.

There is (was?) another bug you can fix: after loading a .kra file the
default pixel of the paint device is not restored and is set to (0,0,0,0). I
think this should be done at the level of KisPaintDevice.

-- 
Dmitry Kazakov
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