Removes the optimization to reduce the display links frame interval

[garrettmoon]

The idea behind this optimization was to reduce the number of calls the display link would need for animated images which didn't draw every frame. But this has resulted in frames being dropped in certain cases where frameInterval isn't respected (see https://i.pinimg.com/originals/58/9c/e8/589ce828d2ef0797da0e85b1c6d2f2b3.gif)

Since the the display link fire method continues if we detect we're at the same image index as before, let's just remove this optimization.

[ghost]

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[bolsinga]

Is it possible to add a test covering this change?