Only annotate num_likes on Top views

[stianjensen]

The num_likes annotation is quite heavy, so avoiding it on pages where it is not used seems smart.

With this, only the TopAllDweetFeed view should be particularly slow, hopefully (the rest of the top views are fast since they start by filtering out a lot of data based on posted at date before doing their sorting).

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[stianjensen]

I think some tests will fail here, because they ensure that num_likes is always set. So I'll update those.