fix: polygon hit detection when map is rotated

[monsieurtanuki]

Fixes #1934.

Removed an optimization that prevented the hit test to work for polygons on rotated maps.

[JaffaKetchup]

Thanks for looking into this :)

(Just had to fix some lint issues, one unrelated but preventing merge.)

[monsieurtanuki]

Thank you @JaffaKetchup for your review!

One optimization path would be to keep the code I've just removed only for map rotation == 0.