Delete duplicate declaration of $deg in contextTrigDegrees

[duffee]

The file has a second declaration of $deg in macros/contextTrigDegrees.pl line 126 (the context::TrigDegrees::numeric2 package) which generates a warning. It's identical to the first declaration and can be removed because the package keyword doesn't provide scope.

Not a pressing issue, just a TODO from #702

[dpvc]

I would recommend changing my to our and keeping both declarations. That will make them package variables, as they seem to be intended to be.

[drgrice1]

This is done in the way that @dpvc suggests in #709.

[duffee]

I see it's fixed now in (or before) #726