FillTessellator: fix vertex attributes along Bezier curves - #960
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When a Bezier curve's endpoints get swapped, the `t` parameter needs to be transformed accordingly (`t -> 1-t`).
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Closes #958.
As explained in the linked issue, when reversing the orientation of a curve in
EventQueueBuilder::{quadratic, cubic}_bezier_segment,tneeds to be exchanged with1-tto leave the parametrization unchanged.