Changed border default for theme_grey()

[annennenne]

Changed theme_grey() setting for legend key so that it creates no border (NA) rather than drawing a white one. (closes #3180)

[paleolimbot]

Hi @annennenne! There are two "visual test cases" that need to be updated, as changing the default theme causes visual changes. If you feel up to it, you can do this yourself by running vdiffr:::vdiffrAddin() in RStudio (you will have to make sure all the dependencies are installed, which you can do using remotes::install_deps(dependencies = TRUE)). If you'd like some help, let me know and I can update the visual test cases for you!

[annennenne]

@paleolimbot Thanks for letting me know. I cannot get the app opened by the vdiffr:::vdiffrAddin() call to work properly, and so I'm not sure what to do then.

[paleolimbot]

I've updated them for this PR...if you'd like to know how to do this for the future, find a helper at TDD (I'm not there, or I'd come over and say hi)!

[paleolimbot]

This looks great! Thanks @annennenne!

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