fix(AnimatedBeam): fix the direction of beam animation execution

[hooray]

The original plan was to compare the positions of the fromRef and toRef elements on the page, and the final execution direction of the beam animation could be from fromRef to toRef, or from toRef to fromRef, which is very uncontrollable because the positions of fromRef and toRef may change due to responsive layouts.

The modified plan is that the beam animation will always be from fromRef to toRef, which is also more in line with the semantics of these 2 props.