[self-interest] Fix for property sheet error from not finding labelMorph font

[Chris Double]

Chris Double <chris.double at double.co.nz> writes:

> This relates to issue 4 but I think that issue is actually a Mac OS X
> backend problem. Can anyone confirm if on Mac OS X that the scalableFont
> slot doesn't exist? I'm guessing the Mac backend doesn't use x11Globals?

I've updated the pull request with a fix for the Mac OS X scalableFont
issue. I implemented it by falling back to x11Global's scalableFont
implementation. I added 'verdana' to the list so it can be selected on
Mac.

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