fixed KMunicate legend position in gallery.Rmd

[DanChaltiel]

Hi,

As you can see in https://www.danieldsjoberg.com/ggsurvfit/articles/gallery.html#kmunicate, the legend is not inside the plot as it should be.

This is because the theme lacks legend.position="inside".

This very minor PR should fix it.

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[ddsjoberg]

Thank you so much @DanChaltiel ! Would you mind adding a snapshot test using vdiffr::expect_doppelganger() so we can ensure this doesn't break again in the future (I am pretty sure this worked before the ggplot2 3.5 release)