Mac OS: whitelist the font .Helvetica Neue DeskInterface

In Mac OS 10.10 (Yosemite), the system font is .Helvetica Neue DeskInterface. But this is not included in font.system.whitelist in TB 5.5a4. Unless doing so will cause fingerprinting concerns, we should add it. I will attach a screenshot that shows that buttons do not look good without it.

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