Plots, InitError: UndefVarError: GR_jll not defined

@t-bltg @jheinen I believe there may be some room for improvement here. I cannot recall why there is a try-catch there to begin with.

Since we are not loading any librarys on import GR_jll, I am failing to imagine how import GR_jll can fail.

Perhaps the try here is just obsolute and we can remove it now?