Straight edge labels incorrectly drawn at origin when angle is 0

[Ted Driggs]

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vis-network 9.1.2, when using an edge with "top" for its label alignment, the label jumps to the origin if the two endpoints have the same y coordinate and from.x > to.x. This is because drawLabel doesn't call translate if the rotation angle is zero here, but Label._setAlignment zeroes out the x and y values here seemingly under the belief that the context has already been translated.