Fix bug with yearly.seasonality = 1

[kylebutts]

Hi,

I'm trying to create a lesson plan for my class teaching them intuition on how prophet works. One thing I want to do is set yearly.seasonality = 0, then 1 so they can see how the plot components vary (and see the Fourier terms). But, there's a small bug in the code that checks arg == TRUE which returns TRUE when arg == 1. Switching to isTRUE() fixes this

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