Update Crafty_diamondIso_polygon implementation
Update Crafty_diamondIso_polygon implementation

Crafty_diamondIso_polygon still uses old Crafty_polygon signature.
This commit fixes that and brings it in line with #835.

mucaho/Crafty,craftyjs/Crafty,maciekwie/Crafty,starwed/Crafty,maciekwie/Crafty,starwed/Crafty,mucaho/Crafty,craftyjs/Crafty,mucaho/Crafty,maciekwie/Crafty,craftyjs/Crafty,starwed/Crafty