simplify tooltip tests

[tdhock]

#328 added tooltipID() helper function for testing polygon holes, https://github.com/animint/animint2/pull/328/files#diff-21d2cb3bc9d48c0acc4b83db0e9c09430f59f35a2f36d625d42c49d60d140584

other tooltip tests should be modified/simplified to use this function.

@Nishita-shah1 can you please do that in another PR, after we merge #328 ?

[Nishita-shah1]

Sure @tdhock , I'll do it.