Collision Editor shapes don't use Tileset Drawing Offset

[Seanba]

To reproduce:

• Add collision shapes to a tile in the Tile Collision Editor
• Modify the "Drawing Offset" values in the tileset properties

Results: When the tile in the collision editor redraws (may have to zoom in/out or move scrollbar) the collider shapes are not drawing with the offset in mind. (Perhaps not a bug but I expect the collider shapes to keep up with the offset.)
Thanks!

[bjorn]

Was a bit of a puzzle to find a nice fix, but it should work properly with the above change. This also seems to fix the painting issues when the tileset's tile offset is changed after selecting a tile in the Tile Collision Editor.

Thanks for the report!