Dashboard tooltips broken

Tooltips might be the wrong word…

The onhover % change in the stats is no longer displaying properly.

「いいね!」 3

Possibly related to:

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Did that fix also address this @eviltrout?

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Looks like no, but this fix does:

https://github.com/discourse/discourse/commit/44f913b9b8a517f2f3767027d0191d07d24299bd

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