hatch: intersection is not counted

Intersection with a start-/end point of a line of a contour with
an angle > pi is not counted (variable counter is not incremented).
For testing use file: https://github.com/smallfix/librecadbugfiles/blob/master/hatch/contour_counter.dxf
and the hatch pattern "hound".
Merge pull request #424 from smallfix/hatchfix2

Thanks!