stylo: Don't add a font-size dependency to the rule cache if the reference size is not our current style.
stylo: Don't add a font-size dependency to the rule cache if the reference size is not our current style.

We enter the Custom(..) code path from other random places, like to remove the
relative lengths from a calc expression while zooming, or whatever craziness
MathML font-size uses, and we don't want to set the dependency on those cases.

MozReview-Commit-ID: HNatSGlzDkK
Signed-off-by: Emilio Cobos Álvarez <86fa523305b8ad6a8a853c04cfef24a0445908d3@crisal.io>

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