refactor(bootstrap): remove an unused argument

[pomerantsev]

$animate not used in this function anymore.

[mary-poppins]

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[caitp]

I don't think this is correct (although I could be wrong, @matsko would know this code better than me).

It looks like ngAnimate.$animate needs to do some work on startup, even though the undecorated version doesn't. I think we need this injected here so that $rootElement gets touched early --- although work done during $compile might make this unnecessary

[pomerantsev]

Great. I'd love to know for sure if this is wrong. Looks like a leftover - $animate was used here previosly, but it was removed at some point.

[matsko]

Merged. Thank you @pomerantsev.